G11B3/00	7	Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor (G11B11/00, {G11B13/00} take precedence)	G11B3/00	G11B3/00		1172
G11B3/001	8	{with vibrating mechanical coupling means between pick-up element and sound producing element}	G11B3/00	G11B3/00		134
G11B3/002	9	{element with stationary record carriers}	G11B3/00	G11B3/00		14
G11B3/003	8	{Devices for transmitting, directing, amplifying sound (in general G10K11/18)}	G11B3/00	G11B3/00		30
G11B3/005	9	{through hollow arms}	G11B3/00	G11B3/00		15
G11B3/006	9	{using horns}	G11B3/00	G11B3/00		30
G11B3/007	8	{Devices for controlling sound, e.g. using acoustical impedances, using valves}	G11B3/00	G11B3/00		13
G11B3/008	8	{for digital information}	G11B3/00	G11B3/00		18
G11B3/02	8	Arrangements of heads	G11B3/02	G11B3/02		431
G11B3/04	9	Multiple, convertible, or alternative transducing arrangements	G11B3/04	G11B3/04		71
G11B3/06	9	Determining or indicating positions of head	G11B3/06	G11B3/06		59
G11B3/08	9	Raising, lowering, traversing otherwise than for transducing, arresting, or holding-up heads against record carriers {(for transducing G11B3/12, G11B3/34)}	G11B3/08	G11B3/08		701
G11B3/085	10	using automatic means (G11B3/095 takes precedence {; if particularly adapted for record-changers seeG11B17/16 and subgroups})	G11B3/085	G11B3/085		108
G11B3/08503	11	{Control of drive of the head}	G11B3/085	G11B3/085		18
G11B3/08506	12	{for pivoting pick-up arms}	G11B3/085	G11B3/085		16
G11B3/08509	13	{using mechanical detecting means}	G11B3/085	G11B3/085		110
G11B3/08512	13	{using optical detecting means}	G11B3/085	G11B3/085		71
G11B3/08516	13	{using magnetic detecting means}	G11B3/085	G11B3/085		30
G11B3/08519	12	{for pick-up arms moving parallel to itself}	G11B3/085	G11B3/085		9
G11B3/08522	13	{using mechanical detecting means}	G11B3/085	G11B3/085		14
G11B3/08525	13	{using optical detecting means}	G11B3/085	G11B3/085		16
G11B3/08529	13	{using magnetic or electric detecting means}	G11B3/085	G11B3/085		10
G11B3/08532	12	{for fixed arms carrying a movable head}	G11B3/085	G11B3/085		8
G11B3/08535	11	{Driving the head}	G11B3/085	G11B3/085		10
G11B3/08538	12	{the head being driven by the same means as the record can}	G11B3/085	G11B3/085		2
G11B3/08541	13	{for pivoting pick-up arms}	G11B3/085	G11B3/085		11
G11B3/08545	14	{driven by cams}	G11B3/085	G11B3/085		142
G11B3/08548	15	{using friction coupling}	G11B3/085	G11B3/085		1
G11B3/08551	16	{for the horizontal movement only}	G11B3/085	G11B3/085		7
G11B3/08554	13	{for pick-up arms moving parallel to itself}	G11B3/085	G11B3/085		12
G11B3/08558	14	{driven by belt or analogous element}	G11B3/085	G11B3/085		7
G11B3/08561	14	{driven by non-skip driving means, e.g. lead screw}	G11B3/085	G11B3/085		7
G11B3/08564	12	{the head being driven by means independent of the record carrier driving means}	G11B3/085	G11B3/085		1
G11B3/08567	13	{for pivoting pick-up arms}	G11B3/085	G11B3/085		12
G11B3/0857	14	{driven by means which support the pick-up arm}	G11B3/085	G11B3/085		25
G11B3/08574	15	{the supporting element being different from the rotation-axes}	G11B3/085	G11B3/085		9
G11B3/08577	16	{for the vertical movement only}	G11B3/085	G11B3/085		4
G11B3/0858	17	{using mechanical means}	G11B3/085	G11B3/085		6
G11B3/08583	17	{using electrical/magnetic means}	G11B3/085	G11B3/085		9
G11B3/08587	13	{for pick-up arm moving parallel to itself}	G11B3/085	G11B3/085		27
G11B3/0859	14	{driven by belt or analogous element}	G11B3/085	G11B3/085		25
G11B3/08593	14	{driven by non-skip driving means, e.g. lead screw}	G11B3/085	G11B3/085		12
G11B3/08596	13	{for fixed arms carrying a movable head}	G11B3/085	G11B3/085		4
G11B3/09	10	using manual means only (G11B3/095 takes precedence)	G11B3/09	G11B3/09		27
G11B3/091	11	{using magnetic means (G11B3/093 takes precedence)}	G11B3/09	G11B3/09		8
G11B3/092	11	{using mechanical means (G11B3/093 takes precedence)}	G11B3/09	G11B3/09		31
G11B3/093	11	{Means coupled to the cover}	G11B3/09	G11B3/09		20
G11B3/095	10	for repeating a part of the record; for beginning or stopping at a desired point of the record	G11B3/095	G11B3/095		164
G11B3/0952	11	{using automatic means}	G11B3/095	G11B3/095		93
G11B3/0955	12	{using mechanical means for detecting the end of the recording}	G11B3/095	G11B3/095		358
G11B3/0957	12	{using optical means for detecting the end of the recording or the desired point thereof}	G11B3/095	G11B3/095		73
G11B3/10	9	Arranging, supporting, or driving of heads or of transducers relatively to record carriers {(guiding record carriers G11B17/00, driving record carriers G11B19/00)}	G11B3/10	G11B3/10		244
G11B3/12	10	Supporting in balanced, counterbalanced or loaded operative position {during transducing}, e.g. loading in direction of traverse	G11B3/12	G11B3/12		98
G11B3/121	11	{By using mechanical means not provided for in G11B3/14, G11B3/20, e.g. using cams}	G11B3/12	G11B3/12		26
G11B3/122	12	{Providing horizontal force, e.g. anti-skating (G11B3/124 takes precedence)}	G11B3/12	G11B3/12		19
G11B3/124	12	{Damping means therefor}	G11B3/12	G11B3/12		17
G11B3/125	11	{by using electric or magnetic means}	G11B3/12	G11B3/12		92
G11B3/127	12	{Providing horizontal force, e.g. anti-skating force (G11B3/128 takes precedence)}	G11B3/12	G11B3/12		44
G11B3/128	12	{Damping means therefor}	G11B3/12	G11B3/12		14
G11B3/14	11	by using effects of gravity or inertia, e.g. counterweight (G11B3/28 takes precedence)	G11B3/14	G11B3/14		145
G11B3/145	12	{Providing horizontal force, e.g. anti-skating force (G11B3/18 takes precedence)}	G11B3/14	G11B3/14		12
G11B3/16	12	adjustable	G11B3/16	G11B3/16		36
G11B3/18	12	Damping by using viscosity effect	G11B3/18	G11B3/18		57
G11B3/20	11	by elastic means, e.g. spring (G11B3/28 takes precedence)	G11B3/20	G11B3/20		169
G11B3/22	12	adjustable	G11B3/22	G11B3/22		16
G11B3/24	12	acting to decrease pressure on record	G11B3/24	G11B3/24		17
G11B3/26	12	acting to increase pressure on record	G11B3/26	G11B3/26		12
G11B3/28	11	providing transverse bias parallel to record<br><br><u>NOTE</u><br><br>see provisionally also G11B3/14, G11B3/20 ) 	G11B3/28	G11B3/28		59
G11B3/30	10	Supporting in an inoperative position	G11B3/30	G11B3/30		45
G11B3/31	11	Construction of arms {(for transmitting, directing or amplifying sound G11B3/003)}	G11B3/31	G11B3/31		121
G11B3/32	11	Construction or arrangement of support pillars	G11B3/32	G11B3/32		116
G11B3/34	10	Driving or guiding during transducing operation	G11B3/34	G11B3/34		216
G11B3/36	11	Automatic-feed mechanisms producing progressive transducing traverse across record carriers otherwise than by grooves, e.g. by lead-screw	G11B3/36	G11B3/36		481
G11B3/38	11	Guiding, e.g. constructions or arrangements providing linear or other special tracking characteristics	G11B3/38	G11B3/38		302
G11B3/40	11	Driving of heads relatively to stationary record carriers for transducing	G11B3/40	G11B3/40		69
G11B3/42	10	with provision for adaptation or interchange of heads	G11B3/42	G11B3/42		120
G11B3/44	8	Styli, e.g. sapphire, diamond	G11B3/44	G11B3/44		166
G11B3/445	9	{Styli particularly adapted for sensing video discs}	G11B3/44	G11B3/44		31
G11B3/46	9	Constructions or forms {; Dispositions or mountings}, e.g. attachment of point to shank {(attachment of stylus directly to transducer H04R1/16)}	G11B3/46	G11B3/46		1440
G11B3/48	10	Needles	G11B3/48	G11B3/48		346
G11B3/50	9	Anvils or other supports opposing stylus forces	G11B3/50	G11B3/50		116
G11B3/52	9	Arrangements permitting styli to yield under excessive pressure	G11B3/52	G11B3/52		18
G11B3/54	9	Storing; Manipulating, e.g. feeding styli to and from heads	G11B3/54	G11B3/54		104
G11B3/56	9	Sharpening (grinding B24B3/00, B24B19/00)	G11B3/56	G11B3/56		59
G11B3/58	8	Cleaning record carriers or styli, e.g. removing shavings or dust {or electrostatic charges}	G11B3/58	G11B3/58		126
G11B3/5809	9	{during transducing operation}	G11B3/58	G11B3/58		2
G11B3/5818	10	{for record carriers}	G11B3/58	G11B3/58		9
G11B3/5827	11	{using means contacting the record carrier}	G11B3/58	G11B3/58		10
G11B3/5836	12	{means connected to the pick-up arm or head}	G11B3/58	G11B3/58		101
G11B3/5845	12	{means connected to a separate arm}	G11B3/58	G11B3/58		74
G11B3/5854	11	{using means not contacting the record carrier}	G11B3/58	G11B3/58		9
G11B3/5863	12	{connected to the pick-up arm or head}	G11B3/58	G11B3/58		6
G11B3/5872	12	{connected to a separate arm}	G11B3/58	G11B3/58		2
G11B3/5881	10	{for styli or needles only}	G11B3/58	G11B3/58		30
G11B3/589	9	{before or after transducing operation}	G11B3/58	G11B3/58		226
G11B3/60	8	Turntables for record carriers<br><br><u>NOTE</u><br><br>contains no documents, seeG11B19/2009.	G11B3/60	G11B3/60		313
G11B3/61	9	Damping of vibrations of record carriers on turntables<br><br><u>NOTE</u><br><br>see provisionally also G11B3/60, G11B3/589 and G11B17/02; contains no documents, seeG11B19/2018.	G11B3/61	G11B3/61		42
G11B3/64	8	Re-recording, i.e. transcribing information from one grooved record carrier on to one or more similar or dissimilar record carriers {(by varying the order of the information G11B27/029, G11B27/036)}	G11B3/64	G11B3/64		73
G11B3/66	8	Erasing information, e.g. for reuse of record carrier	G11B3/66	G11B3/66		35
G11B3/68	8	Record carriers	G11B3/68	G11B3/68		81
G11B3/682	9	{comprising protective coatings, e.g. anti static, anti-friction}	G11B3/68	G11B3/68		34
G11B3/685	9	{Intermediate mediums}	G11B3/68	G11B3/68		19
G11B3/687	9	{Testing thereof (investigating chemical or physical properties of materials G01N)}	G11B3/68	G11B3/68		8
G11B3/70	9	characterised by the selection of material or structure; Processes or apparatus specially adapted for manufacturing record carriers	G11B3/70	G11B3/70		1052
G11B3/702	10	{for video discs with grooves (G11B3/705 takes precedence)}	G11B3/70	G11B3/70		14
G11B3/705	10	{characterised by the selection of the material only}	G11B3/70	G11B3/70		92
G11B3/707	11	{for video discs with grooves}	G11B3/70	G11B3/70		13
G11B3/72	9	Groove formations, e.g. run-in groove, run-out groove	G11B3/72	G11B3/72		102
G11B3/74	10	Multiple output tracks, e.g. binaural stereophonic	G11B3/74	G11B3/74		29
G11B3/76	10	forming part of cinematograph films	G11B3/76	G11B3/76		9
G11B3/78	9	Multiple-track arrangements	G11B3/78	G11B3/78		36
G11B3/80	9	incorporating subsidiary guide means for heads, other than modulated grooves; Part-formed unmodulated grooves for conversion into transducing grooves	G11B3/80	G11B3/80		11
G11B3/90	9	with means indicating prior or unauthorised use	G11B3/90	G11B3/90		4
G11B5/00	7	Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00{and G11B13/00} take precedence)<br><br><u>NOTE</u><br><br> Subgroups G11B5/02&#160;-&#160;G11B5/86 take precedence over subgroups G11B5/004&#160;-&#160;G11B5/016	G11B5/00	G11B5/00		2103
G11B2005/0002	8	{Special dispositions or recording techniques}	G11B5/00	G11B5/00		716
G11B2005/0005	9	{Arrangements, methods or circuits}	G11B5/00	G11B5/00		604
G11B2005/0008	10	{Magnetic conditionning of heads, e.g. biasing}	G11B5/00	G11B5/00		263
G11B2005/001	10	{Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure}	G11B5/00	G11B5/00		773
G11B2005/0013	11	{of transducers, e.g. linearisation, equalisation}	G11B5/00	G11B5/00		366
G11B2005/0016	12	{of magnetoresistive transducers}	G11B5/00	G11B5/00		536
G11B2005/0018	13	{by current biasing control or regulation}	G11B5/00	G11B5/00		361
G11B2005/0021	10	{Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal}	G11B5/00	G11B5/00		2254
G11B2005/0024	10	{Microwave assisted recording}	G11B5/00	G11B5/00		451
G11B2005/0026	9	{Pulse recording}	G11B5/00	G11B5/00		30
G11B2005/0029	10	{using magnetisation components of the recording layer disposed mainly perpendicularly to the record carrier surface}	G11B5/00	G11B5/00		375
G11B2005/0032	9	{Transducing means or record carriers including or interacting with each other through interposition of, a physically controllable magnetic flux masking or focusing element}	G11B5/00	G11B5/00		8
G11B2005/0034	10	{switchable at least locally between two different physical states, e.g. magnetic and non-magnetic}	G11B5/00	G11B5/00		10
G11B2005/0037	11	{using superconductive elements}	G11B5/00	G11B5/00		5
G11B5/004	8	Recording on, or reproducing or erasing from, magnetic drums (G11B19/00 takes precedence)	G11B5/004	G11B5/004		517
G11B5/008	8	Recording on, or reproducing or erasing from, magnetic tapes, {sheets, e.g. cards,} or wires (G11B15/00{G11B19/00} take precedence; {bulk transferring of information magnetisation for re-recording G11B5/865; marking record carriers in digital fashion G06K})	G11B5/008	G11B5/008		795
G11B5/00804	9	{magnetic sheets (rotating sheets G11B5/012)}	G11B5/008	G11B5/008		29
G11B5/00808	10	{magnetic cards}	G11B5/008	G11B5/008		157
G11B5/00813	9	{magnetic tapes}	G11B5/008	G11B5/008		1230
G11B5/00817	10	{on longitudinal tracks only, e.g. for serpentine format recording}	G11B5/008	G11B5/008		361
G11B5/00821	11	{using stationary heads}	G11B5/008	G11B5/008		121
G11B5/00826	12	{comprising a plurality of single poles or gaps or groups thereof operative at the same time}	G11B5/008	G11B5/008		252
G11B5/0083	13	{for parallel information processing, e.g. PCM recording}	G11B5/008	G11B5/008		56
G11B5/00834	12	{using virtual scanning heads}	G11B5/008	G11B5/008		4
G11B5/00839	11	{using cyclically driven heads providing segmented tracks}	G11B5/008	G11B5/008		39
G11B2005/00843	11	{allowing digital compact cassette [DCC] format recording}	G11B5/008	G11B5/008		5
G11B5/00847	10	{on transverse tracks (G11B5/00878 takes precedence)}	G11B5/008	G11B5/008		10
G11B5/00852	11	{using stationary heads}	G11B5/008	G11B5/008		12
G11B5/00856	12	{comprising a plurality of single poles or gaps or groups thereof operative in time sequence}	G11B5/008	G11B5/008		12
G11B5/0086	11	{using cyclically driven heads providing segmented tracks}	G11B5/008	G11B5/008		855
G11B5/00865	12	{for transducing on more than one segment simultaneously}	G11B5/008	G11B5/008		60
G11B5/00869	13	{the segments being disposed in different lateral zones of the tape}	G11B5/008	G11B5/008		13
G11B5/00873	13	{the segments being disposed in different longitudinal zones of the tape}	G11B5/008	G11B5/008		20
G11B5/00878	10	{transducing different track configurations or formats on the same tape}	G11B5/008	G11B5/008		220
G11B5/00882	11	{configurations only, e.g. longitudinal and transverse}	G11B5/008	G11B5/008		9
G11B5/00886	12	{simultaneously}	G11B5/008	G11B5/008		2
G11B5/00891	11	{formats only, e.g. analog and digital}	G11B5/008	G11B5/008		25
G11B5/00895	12	{simultaneously}	G11B5/008	G11B5/008		3
G11B5/012	8	Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence)	G11B5/012	G11B5/012		3870
G11B5/016	9	using magnetic foils	G11B5/016	G11B5/016		184
G11B5/02	8	Recording, reproducing, or erasing methods; Read, write or erase circuits therefor	G11B5/02	G11B5/02		3170
G11B5/022	9	{H-Bridge head driver circuit, the "H" configuration allowing to inverse the current direction in the head}	G11B5/02	G11B5/02		198
G11B5/024	9	Erasing	G11B5/024	G11B5/024		580
G11B5/0245	10	{Bulk erasing}	G11B5/024	G11B5/024		250
G11B5/027	9	Analogue recording	G11B5/027	G11B5/027		284
G11B5/0275	10	{Boundary displacement recording}	G11B5/027	G11B5/027		17
G11B5/03	10	Biasing	G11B5/03	G11B5/03		659
G11B5/035	10	Equalising	G11B5/035	G11B5/035		645
G11B5/09	9	Digital recording	G11B5/09	G11B5/09		2577
G11B5/10	8	Structure or manufacture of housings or shields for heads	G11B5/10	G11B5/10		1285
G11B5/102	9	{Manufacture of housing}	G11B5/10	G11B5/10		343
G11B5/105	9	Mounting of head within housing {or assembling of head and housing (G11B5/3103 takes precedence)}	G11B5/105	G11B5/105		1004
G11B5/11	9	Shielding of head against electric or magnetic fields	G11B5/11	G11B5/11		881
G11B5/112	10	{Manufacture of shielding device}	G11B5/11	G11B5/11		198
G11B5/115	10	Shielding devices arranged between heads or windings ({G11B5/265} , G11B5/29 take precedence)	G11B5/115	G11B5/115		160
G11B5/127	8	Structure or manufacture of heads, e.g. inductive	G11B5/127	G11B5/127		2072
G11B5/1272	9	{Assembling or shaping of elements (G11B5/1278 takes precedence)}	G11B5/127	G11B5/127		850
G11B5/1274	9	{with "composite" cores, i.e. cores composed in some parts of magnetic particles and in some other parts of magnetic metal layers}	G11B5/127	G11B5/127		59
G11B5/1276	10	{including at least one magnetic thin film}	G11B5/127	G11B5/127		73
G11B5/1278	9	{specially adapted for magnetisations perpendicular to the surface of the record carrier}	G11B5/127	G11B5/127		3226
G11B5/133	9	with cores composed of particles, e.g. with dust cores, with ferrite cores {with cores composed of isolated magnetic particles (in thin films G11B5/31)}	G11B5/133	G11B5/133		244
G11B5/1335	10	{Assembling or shaping of elements}	G11B5/133	G11B5/133		166
G11B5/147	9	with cores being composed of metal sheets, i.e. laminated cores {with cores composed of isolated magnetic layers, e.g. sheets (in thin films G11B5/31)}	G11B5/147	G11B5/147		449
G11B5/1475	10	{Assembling or shaping of elements (G11B5/153 takes precedence)}	G11B5/147	G11B5/147		300
G11B5/153	10	with tape-wound cores	G11B5/153	G11B5/153		12
G11B5/17	9	Construction or disposition of windings	G11B5/17	G11B5/17		1339
G11B5/187	9	Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features (G11B5/265, {G11B5/29} , G11B5/31 take precedence)	G11B5/187	G11B5/187		1129
G11B5/1871	10	{Shaping or contouring of the transducing or guiding surface}	G11B5/187	G11B5/187		1038
G11B5/1872	11	{for improving the form of the electrical signal transduced, e.g. compensation of "contour effect"}	G11B5/187	G11B5/187		36
G11B5/1874	12	{specially adapted for composite pole pieces, e.g. for avoiding "pseudo-gap"}	G11B5/187	G11B5/187		23
G11B5/1875	10	{"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers}	G11B5/187	G11B5/187		38
G11B5/1877	11	{including at least one magnetic thin film}	G11B5/187	G11B5/187		31
G11B5/1878	12	{disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure}	G11B5/187	G11B5/187		221
G11B5/193	10	the pole pieces being ferrite {or other magnetic particles (G11B5/1871 takes precedence; in thin film G11B5/31)}	G11B5/193	G11B5/193		206
G11B5/21	10	the pole pieces being of ferrous sheet metal {or other magnetic layers (G11B5/1871 takes precedence; in thin film G11B5/31)}	G11B5/21	G11B5/21		184
G11B5/23	10	Gap features {(G11B5/1871, G11B5/1875, G11B5/265, G11B5/29, G11B5/488 and subgroups, G11B5/4907 and subgroups, G11B5/4969 and subgroups take precedence)}	G11B5/23	G11B5/23		465
G11B5/232	11	{Manufacture of gap}	G11B5/23	G11B5/23		465
G11B5/235	11	Selection of material for gap filler {(G11B5/232 takes precedence)}	G11B5/235	G11B5/235		350
G11B5/245	10	comprising means for controlling the reluctance of the magnetic circuit {in a head with single gap, for co-operation with one track}(G11B5/255 takes precedence)	G11B5/245	G11B5/245		186
G11B5/2452	11	{where the dimensions of the effective gap are controlled}	G11B5/245	G11B5/245		139
G11B5/2455	12	{the magnetic circuit including at least one magnetic thin film of controllable properties (for scanning G11B5/4938)}	G11B5/245	G11B5/245		8
G11B5/2457	13	{disposed immediately adjacent to the gap ("composite" pole pieces G11B5/1877)}	G11B5/245	G11B5/245		12
G11B5/255	10	comprising means for protection against wear {(in thin film structures G11B5/3106)}	G11B5/255	G11B5/255		485
G11B5/265	9	Structure or manufacture of a head with more than one gap for erasing, recording or reproducing on the same track (G11B5/33 takes precedence {in thin film structures G11B5/31})	G11B5/265	G11B5/265		530
G11B5/2651	10	{Manufacture}	G11B5/265	G11B5/265		256
G11B5/2652	10	{with more than one gap simultaneously operative (with controlled single gap G11B5/245)}	G11B5/265	G11B5/265		57
G11B5/2654	11	{for recording or erasing}	G11B5/265	G11B5/265		54
G11B5/2655	12	{with all the gaps disposed within the track or "guard band" between tracks, e.g. with erase gaps operative on track edges, with wide erase gap followed by narrow write gap}	G11B5/265	G11B5/265		119
G11B5/2657	13	{all the gaps having the same dimension in the direction transverse to the track direction}	G11B5/265	G11B5/265		24
G11B5/2658	14	{for recording with premagnetization or biasing of record carrier or head}	G11B5/265	G11B5/265		13
G11B5/29	9	Structure or manufacture of unitary devices formed of plural heads for more than one track {(G11B5/33, G11B5/49 and subgroups take precedence; in thin film structure G11B5/31)}	G11B5/29	G11B5/29		758
G11B5/295	10	{Manufacture}	G11B5/29	G11B5/29		238
G11B5/31	9	using thin films {(G11B5/1274, G11B5/1278, G11B5/1874, G11B5/1875, G11B5/33, G11B5/49 take precedence; magnetic thin film structures H01F10/00)}	G11B5/31	G11B5/31		724
G11B5/3103	10	{Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing}	G11B5/31	G11B5/31		994
G11B5/3106	11	{where the integrated or assembled structure comprises means for conditioning against physical detrimental influence, e.g. wear, contamination (G11B5/3133 takes precedence)}	G11B5/31	G11B5/31		1091
G11B5/3109	10	{Details (G11B5/3103 takes precedence)}	G11B5/31	G11B5/31		424
G11B5/3113	11	{for improving the magnetic domain structure or avoiding the formation or displacement of undesirable magnetic domains}	G11B5/31	G11B5/31		354
G11B5/3116	11	{Shaping of layers, poles or gaps for improving the form of the electrical signal transduced, e.g. for shielding, contour effect, equalizing, side flux fringing, cross talk reduction between heads or between heads and information tracks (G11B5/3113, G11B5/245 take precedence)}	G11B5/31	G11B5/31		2470
G11B5/312	11	{for reducing flux leakage between the electrical coil layers and the magnetic cores or poles or between the magnetic cores or poles}	G11B5/31	G11B5/31		115
G11B5/3123	12	{by using special coil configurations or conductors}	G11B5/31	G11B5/31		199
G11B5/3126	13	{using superconductors}	G11B5/31	G11B5/31		13
G11B5/313	11	{Disposition of layers}	G11B5/31	G11B5/31		1216
G11B5/3133	12	{including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure (G11B5/3106 takes precedence)}	G11B5/31	G11B5/31		864
G11B5/3136	13	{for reducing the pole-tip-protrusion at the head transducing surface, e.g. caused by thermal expansion of dissimilar materials}	G11B5/31	G11B5/31		288
G11B5/314	13	{where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence)}	G11B5/31	G11B5/31		1401
G11B5/3143	12	{including additional layers for improving the electromagnetic transducing properties of the basic structure, e.g. for flux coupling, guiding or shielding (G11B5/3116, G11B5/312 take precedence)}	G11B5/31	G11B5/31		280
G11B5/3146	13	{magnetic layers}	G11B5/31	G11B5/31		633
G11B5/315	14	{Shield layers on both sides of the main pole, e.g. in perpendicular magnetic heads}	G11B5/31	G11B5/31		592
G11B5/3153	14	{including at least one magnetic thin film coupled by interfacing to the basic magnetic thin film structure}	G11B5/31	G11B5/31		198
G11B5/3156	15	{providing interaction by induced or exchange coupling}	G11B5/31	G11B5/31		38
G11B5/3159	13	{superconductive layers}	G11B5/31	G11B5/31		6
G11B5/3163	10	{Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers}	G11B5/31	G11B5/31		3304
G11B5/3166	11	{Testing or indicating in relation thereto, e.g. before the fabrication is completed}	G11B5/31	G11B5/31		527
G11B5/3169	11	{Working or finishing the interfacing surface of heads, e.g. lapping of heads}	G11B5/31	G11B5/31		361
G11B5/3173	11	{Batch fabrication, i.e. producing a plurality of head structures in one batch}	G11B5/31	G11B5/31		371
G11B5/3176	10	{Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps (G11B5/2455, G11B5/265 take precedence)}	G11B5/31	G11B5/31		22
G11B5/3179	11	{the films being mainly disposed in parallel planes}	G11B5/31	G11B5/31		19
G11B5/3183	12	{intersecting the gap plane, e.g. "horizontal head structure"}	G11B5/31	G11B5/31		276
G11B5/3186	12	{parallel to the gap plane, e.g. "vertical head structure"}	G11B5/31	G11B5/31		32
G11B5/3189	10	{Testing}	G11B5/31	G11B5/31		45
G11B5/3193	11	{of films or layers, e.g. continuity test}	G11B5/31	G11B5/31		11
G11B5/3196	12	{of thin magnetic films, e.g. functional testing of the transducing properties (G11B5/455 takes precedence)}	G11B5/31	G11B5/31		28
G11B5/325	9	Erasing heads using permanent magnets (general details therefor G11B5/133&#160;-&#160;G11B5/255)	G11B5/325	G11B5/325		120
G11B5/33	9	Structure or manufacture of flux-sensitive heads, {i.e. for reproduction only; Combination of such heads with means for recording or erasing only}({Single head using magnetic domains for scanning G11B5/4946; multiple head for scanning G11B5/4907 and subgroups } ; general details therefor G11B5/133&#160;-&#160;G11B5/255)	G11B5/33	G11B5/33		300
G11B5/332	10	{using thin films (G11B5/372, G11B5/3903 take precedence)}	G11B5/33	G11B5/33		269
G11B5/335	10	with saturated jig, e.g. for detecting second harmonic; balanced flux head	G11B5/335	G11B5/335		97
G11B5/35	10	having vibrating elements	G11B5/35	G11B5/35		75
G11B5/37	10	using galvano-magnetic devices, e.g. Hall-effect devices (G11B5/39 takes precedence){using Hall or Hall-related effect, e.g. planar-Hall effect or pseudo-Hall effect}	G11B5/37	G11B5/37		117
G11B5/372	11	{in magnetic thin films}	G11B5/37	G11B5/37		25
G11B5/374	12	{Integrated structures}	G11B5/37	G11B5/37		35
G11B5/376	11	{in semi-conductors (G11B5/372 takes precedence)}	G11B5/37	G11B5/37		63
G11B5/378	12	{Integrated structures}	G11B5/37	G11B5/37		41
G11B5/39	10	using magneto-resistive devices {or effects}	G11B5/39	G11B5/39		799
G11B5/3903	11	{using magnetic thin film layers or their effects, the films being part of integrated structures}	G11B5/39	G11B5/39		2692
G11B5/3906	12	{Details related to the use of magnetic thin film layers or to their effects}	G11B5/39	G11B5/39		760
G11B5/3909	13	{Arrangements using a magnetic tunnel junction}	G11B5/39	G11B5/39		1291
G11B5/3912	13	{Arrangements in which the active read-out elements are transducing in association with active magnetic shields, e.g. magnetically coupled shields (G11B5/3916 takes precedence)}	G11B5/39	G11B5/39		715
G11B5/3916	13	{Arrangements in which the active read-out elements are coupled to the magnetic flux of the track by at least one magnetic thin film flux guide}	G11B5/39	G11B5/39		83
G11B5/3919	14	{the guide being interposed in the flux path}	G11B5/39	G11B5/39		73
G11B5/3922	15	{the read-out elements being disposed in magnetic shunt relative to at least two parts of the flux guide structure}	G11B5/39	G11B5/39		33
G11B5/3925	16	{the two parts being thin films}	G11B5/39	G11B5/39		257
G11B5/3929	13	{Disposition of magnetic thin films not used for directly coupling magnetic flux from the track to the MR film or for shielding}	G11B5/39	G11B5/39		246
G11B5/3932	14	{Magnetic biasing films}	G11B5/39	G11B5/39		988
G11B5/3935	14	{Flux closure films not being part of the track flux guides}	G11B5/39	G11B5/39		29
G11B5/3938	15	{the flux closure films being used for absorbing or reducing demagnetisating or saturating fields}	G11B5/39	G11B5/39		27
G11B5/3941	15	{the flux closure films being used for providing a closed magnetic circuit to the MR film}	G11B5/39	G11B5/39		10
G11B5/3945	13	{Heads comprising more than one sensitive element}	G11B5/39	G11B5/39		105
G11B5/3948	14	{the sensitive elements being active read-out elements}	G11B5/39	G11B5/39		172
G11B5/3951	15	{the active elements being arranged on several parallel planes}	G11B5/39	G11B5/39		57
G11B5/3954	16	{the active elements transducing on a single track}	G11B5/39	G11B5/39		213
G11B5/3958	15	{the active elements being arranged in a single plane, e.g. "matrix" disposition}	G11B5/39	G11B5/39		91
G11B5/3961	16	{disposed at an angle to the direction of the track or relative movement}	G11B5/39	G11B5/39		28
G11B5/3964	17	{for transducing on a single track}	G11B5/39	G11B5/39		45
G11B5/3967	12	{Composite structural arrangements of transducers, e.g. inductive write and magnetoresistive read (G11B5/3906 takes precedence)}	G11B5/39	G11B5/39		1558
G11B5/397	13	{with a plurality of independent magnetoresistive active read-out elements for respectively transducing from selected components}	G11B5/39	G11B5/39		46
G11B5/3974	14	{from the same information track, e.g. frequency bands}	G11B5/39	G11B5/39		21
G11B5/3977	14	{from different information tracks}	G11B5/39	G11B5/39		77
G11B5/398	12	{Specially shaped layers}	G11B5/39	G11B5/39		562
G11B5/3983	13	{with current confined paths in the spacer layer}	G11B5/39	G11B5/39		48
G11B5/3987	13	{with provision for closing the magnetic flux during operation}	G11B5/39	G11B5/39		24
G11B5/399	12	{with intrinsic biasing, e.g. provided by equipotential strips}	G11B5/39	G11B5/39		175
G11B5/3993	12	{in semi-conductors}	G11B5/39	G11B5/39		62
G11B2005/3996	11	{large or giant magnetoresistive effects [GMR], e.g. as generated in spin-valve [SV] devices}	G11B5/39	G11B5/39		1903
G11B5/40	8	Protective measures on heads, e.g. against excessive temperature&#160; (G11B5/31&#160;takes precedence; protection against wear&#160;G11B5/255&#160; {; protective structure of the head:&#160;see&#160;under structures, e.g.&#160;G11B5/3106})	G11B5/40	G11B5/40		1571
G11B5/41	8	Cleaning of heads {(of record carriers G11B23/50)}	G11B5/41	G11B5/41		900
G11B5/455	8	Arrangements for functional testing of heads; Measuring arrangements for heads	G11B5/455	G11B5/455		1146
G11B5/4555	9	{by using a spin-stand, i.e. a spinning disc or simulator}	G11B5/455	G11B5/455		135
G11B5/465	8	Arrangements for demagnetisation of heads	G11B5/465	G11B5/465		200
G11B5/48	8	Disposition or mounting of heads {or head supports} relative to record carriers {(mounting of head within housing G11B5/105); arrangements of heads, e.g. for scanning the record carrier to increase the relative speed (driving of both record carriers and head G11B15/18; guiding record carriers G11B15/60; head selecting circuits G11B15/12)}	G11B5/48	G11B5/48		1327
G11B5/4806	9	{specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives (G11B5/488&#160;-&#160;G11B5/54 take precedence)}	G11B5/48	G11B5/48		539
G11B5/4813	10	{Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm (G11B5/484 takes precedence)}	G11B5/48	G11B5/48		895
G11B5/4826	10	{Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive (G11B5/484 takes precedence; details of head housings or structures G11B5/10, G11B5/127; adjustment relative to the record carrier G11B5/56)}	G11B5/48	G11B5/48		1266
G11B5/483	11	{Piezoelectric devices between head and arm, e.g. for fine adjustment}	G11B5/48	G11B5/48		261
G11B5/4833	10	{Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head (G11B5/484 takes precedence)}	G11B5/48	G11B5/48		1243
G11B5/484	10	{Integrated arm assemblies, e.g. formed by material deposition or by etching from single piece of metal or by lamination of materials forming a single arm/suspension/head unit}	G11B5/48	G11B5/48		467
G11B5/4846	10	{Constructional details of the electrical connection between arm and support}	G11B5/48	G11B5/48		362
G11B5/4853	10	{Constructional details of the electrical connection between head and arm}	G11B5/48	G11B5/48		756
G11B5/486	10	{with provision for mounting or arranging electrical conducting means or circuits on or along the arm assembly}	G11B5/48	G11B5/48		869
G11B5/4866	10	{the arm comprising an optical waveguide, e.g. for thermally-assisted recording}	G11B5/48	G11B5/48		332
G11B5/4873	10	{the arm comprising piezoelectric or other actuators for adjustment of the arm}	G11B5/48	G11B5/48		387
G11B5/488	9	{Disposition of heads (G11B5/49, G11B5/52 take precedence)}	G11B5/48	G11B5/48		500
G11B5/4886	10	{relative to rotating disc}	G11B5/48	G11B5/48		971
G11B5/4893	10	{relative to moving tape}	G11B5/48	G11B5/48		748
G11B5/49	9	Fixed mounting {or arrangements, e.g. one head per track}	G11B5/49	G11B5/49		220
G11B5/4907	10	{Details for scanning (G11B5/4969 takes precedence)}	G11B5/49	G11B5/49		177
G11B5/4915	11	{Structure of specially adapted heads (G11B5/3906 takes precedence)}	G11B5/49	G11B5/49		26
G11B5/4923	12	{in which zones of the transducing part are being physically controllable}	G11B5/49	G11B5/49		13
G11B5/493	13	{Control of magnetic properties, e.g. saturation, anisotropy}	G11B5/49	G11B5/49		4
G11B5/4938	14	{of thin magnetic films}	G11B5/49	G11B5/49		6
G11B5/4946	15	{for formation or displacement of magnetic domains, e.g. walls, bubbles}	G11B5/49	G11B5/49		47
G11B5/4953	12	{part of the structure being mechanically or magnetically coupled to or decoupled from, the transducing part}	G11B5/49	G11B5/49		7
G11B5/4961	11	{Circuits}	G11B5/49	G11B5/49		9
G11B5/4969	10	{Details for track selection or addressing}	G11B5/49	G11B5/49		211
G11B5/4976	11	{Disposition of heads, e.g. matrix arrangement}	G11B5/49	G11B5/49		107
G11B5/4984	11	{Structure of specially adapted switching heads (G11B5/3958 takes precedence)}	G11B5/49	G11B5/49		28
G11B5/4992	11	{Circuits}	G11B5/49	G11B5/49		44
G11B5/50	9	Interchangeable mountings, e.g. for replacement of head without readjustment	G11B5/50	G11B5/50		69
G11B5/52	9	with simultaneous movement of head and record carrier, e.g. rotation of head (G11B5/588 takes precedence)	G11B5/52	G11B5/52		536
G11B5/53	10	Disposition or mounting of heads on rotating support	G11B5/53	G11B5/53		1491
G11B5/531	11	{Disposition of more than one recording or reproducing head on support rotating cyclically around an axis}	G11B5/53	G11B5/53		674
G11B5/532	12	{Parallel to the direction of movement of the tape, e.g. for transversal scanning}	G11B5/53	G11B5/53		12
G11B5/534	12	{inclined relative to the direction of movement of the tape, e.g. for helicoidal scanning}	G11B5/53	G11B5/53		316
G11B5/535	12	{perpendicular to the direction of movement of the tape, e.g. for longitudinal scanning}	G11B5/53	G11B5/53		16
G11B5/537	13	{with all the heads disposed in a plane substantially parallel to the plane of the tape, e.g. for circular scanning}	G11B5/53	G11B5/53		27
G11B5/538	11	{Disposition or mounting of pole pieces on rotating support (magnetic switching of fixed head arrangements G11B5/49)}	G11B5/53	G11B5/53		76
G11B5/54	9	with provision for moving the head into or out of its operative position or across tracks	G11B5/54	G11B5/54		1928
G11B5/55	10	Track change, selection or acquisition by displacement of the head	G11B5/55	G11B5/55		271
G11B5/5504	11	{across tape tracks}	G11B5/55	G11B5/55		317
G11B5/5508	12	{Control circuits therefor (G11B5/5513 takes precedence)}	G11B5/55	G11B5/55		215
G11B5/5513	11	{Specially adapted for transducing in both travelling directions of tape}	G11B5/55	G11B5/55		40
G11B5/5517	12	{Controlled by automatic tape drive reversing arrangement (reversing tape drive arrangements G11B15/444)}	G11B5/55	G11B5/55		63
G11B5/5521	11	{across disk tracks (spiral track following G11B5/596)}<br><br><u>NOTE</u><br><br>For groups G11B5/5526&#160;-&#160;G11B5/5582, see provisionally G11B5/5521 and G11B5/596.	G11B5/55	G11B5/55		1502
G11B5/5526	12	{Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof (G11B5/556 takes precedence)}	G11B5/55	G11B5/55		915
G11B5/553	13	{Details}	G11B5/55	G11B5/55		186
G11B5/5534	14	{Initialisation, calibration, e.g. cylinder "set-up"}	G11B5/55	G11B5/55		462
G11B5/5539	15	{Skew adjustment, e.g. adjustment of the position of the first sector in each track with respect to the other tracks, for improving, e.g. access performance}	G11B5/55	G11B5/55		50
G11B5/5543	15	{servo-format therefor}	G11B5/55	G11B5/55		74
G11B5/5547	14	{"Seek" control and circuits therefor (G11B5/5556 takes precedence)}	G11B5/55	G11B5/55		829
G11B5/5552	12	{using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means}	G11B5/55	G11B5/55		758
G11B5/5556	13	{with track following after a "seek"}	G11B5/55	G11B5/55		130
G11B5/556	14	{control circuits therefor}	G11B5/55	G11B5/55		81
G11B5/5565	12	{system adaptation for compensation of variations of physical parameters, e.g. temperature}	G11B5/55	G11B5/55		265
G11B5/5569	12	{details of specially adapted mobile parts, e.g. electromechanical control devices (motors in general H02K)}	G11B5/55	G11B5/55		227
G11B5/5573	13	{Details of the magnetic circuit, e.g. of actuators}	G11B5/55	G11B5/55		74
G11B5/5578	13	{Multiple actuators addressing the same disk, e.g. to improve data rate or access rate}	G11B5/55	G11B5/55		121
G11B5/5582	12	{system adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock}	G11B5/55	G11B5/55		524
G11B5/5586	12	{Minimising seek noise, e.g. actuator noise}	G11B5/55	G11B5/55		36
G11B5/5591	11	{across drum tracks}	G11B5/55	G11B5/55		66
G11B5/5595	12	{Control circuits therefor}	G11B5/55	G11B5/55		5
G11B5/56	9	with provision for moving the head {support} for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering ({G11B5/52,}G11B5/54, G11B5/58 take precedence)	G11B5/56	G11B5/56		892
G11B5/58	9	with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following {(spacing means incorporated in the head structure G11B5/187, G11B5/255, G11B5/3106)}	G11B5/58	G11B5/58		971
G11B5/581	10	{maintaining desired contact or spacing by direct interaction of forces generated between heads or supports thereof and record carriers or supports thereof, e.g. attraction-repulsion interactions}	G11B5/58	G11B5/58		89
G11B5/582	11	{interactions in a magnetic field}	G11B5/58	G11B5/58		22
G11B5/583	12	{using repulsion generated by superconductors in a magnetic field, e.g. by "Meissner effect"}	G11B5/58	G11B5/58		16
G11B5/584	10	for track following on tapes	G11B5/584	G11B5/584		1370
G11B5/588	11	by controlling the position of the rotating heads (by controlling the speed of the record carrier G11B15/467; by controlling speed of the heads G11B15/473; {by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G11B15/1841})	G11B5/588	G11B5/588		635
G11B5/592	12	using bimorph elements supporting the heads	G11B5/592	G11B5/592		347
G11B5/5921	13	{using auxiliary signals, e.g. pilot signals}	G11B5/592	G11B5/592		54
G11B5/5922	14	{superimposed on the main signal}	G11B5/592	G11B5/592		103
G11B5/5923	14	{recorded in horizontal suppression internal of video frame}	G11B5/592	G11B5/592		1
G11B5/5925	14	{recorded in vertical suppression internal of video frame}	G11B5/592	G11B5/592		2
G11B5/5926	14	{recorded in separate tracks, e.g. servo tracks}	G11B5/592	G11B5/592		42
G11B5/5927	15	{Helicoidal tracks}	G11B5/592	G11B5/592		5
G11B5/5928	15	{Longitudinal tracks}	G11B5/592	G11B5/592		53
G11B5/596	10	for track following on disks {(G11B5/5526, G11B5/5552, G11B5/5565, G11B5/5582 take precedence)}<br><br><u>NOTE</u><br><br> For groups G11B5/59605&#160;-&#160;G11B5/59633, see provisionally G11B5/5521 and G11B5/596.	G11B5/596	G11B5/596		1011
G11B5/59605	11	{Circuits (G11B5/59627&#160;-&#160;G11B5/59688 take precedence)}	G11B5/596	G11B5/596		263
G11B5/59611	12	{Detection or processing of peak/envelop signals}	G11B5/596	G11B5/596		198
G11B5/59616	12	{Synchronisation; Clocking (G11B5/59622 takes precedence)}	G11B5/596	G11B5/596		251
G11B5/59622	12	{Gain control; Filters}	G11B5/596	G11B5/596		244
G11B5/59627	11	{Aligning for runout, eccentricity or offset compensation (G11B5/5534, G11B5/59677, G11B5/59688 take precedence)}	G11B5/596	G11B5/596		1035
G11B5/59633	11	{Servo formatting (G11B5/59627, G11B5/59677, G11B5/59683, G11B5/59688 take precedence)}	G11B5/596	G11B5/596		938
G11B5/59638	12	{Servo formatting apparatuses, e.g. servo-writers}	G11B5/596	G11B5/596		208
G11B5/59644	12	{Acquisition or selection of servo format from a system reference (after track seek G11B5/5556)}	G11B5/596	G11B5/596		165
G11B5/5965	12	{Embedded servo format (G11B5/59655 takes precedence)}	G11B5/596	G11B5/596		123
G11B5/59655	12	{Sector, sample or burst servo format}	G11B5/596	G11B5/596		601
G11B5/59661	12	{Spiral servo format}	G11B5/596	G11B5/596		179
G11B5/59666	12	{Self servo writing}	G11B5/596	G11B5/596		237
G11B5/59672	12	{Servo re-writing, e.g. for the correction of offsets or &apos;fading&apos; of servo marks}	G11B5/596	G11B5/596		39
G11B5/59677	11	{with optical servo tracking}	G11B5/596	G11B5/596		161
G11B5/59683	11	{for magnetoresistive heads}	G11B5/596	G11B5/596		194
G11B5/59688	11	{Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns}	G11B5/596	G11B5/596		737
G11B5/59694	11	{System adaptation for working during or after external perturbation, e.g. in the presence of a mechanical oscillation caused by a shock}	G11B5/596	G11B5/596		169
G11B5/60	10	Fluid-dynamic spacing of heads from record-carriers	G11B5/60	G11B5/60		440
G11B5/6005	11	{Specially adapted for spacing from a rotating disc using a fluid cushion}	G11B5/60	G11B5/60		2748
G11B5/6011	12	{Control of flying height}	G11B5/60	G11B5/60		245
G11B5/6017	13	{using capacitive measurement}	G11B5/60	G11B5/60		60
G11B5/6023	13	{using inductive measurement}	G11B5/60	G11B5/60		6
G11B5/6029	13	{Measurement using values derived from the data signal read from the disk}	G11B5/60	G11B5/60		241
G11B5/6035	13	{using electrostatic forces}	G11B5/60	G11B5/60		20
G11B5/6041	13	{using magnetic forces}	G11B5/60	G11B5/60		12
G11B5/6047	13	{using magnetostrictive means}	G11B5/60	G11B5/60		2
G11B5/6052	13	{using optical means}	G11B5/60	G11B5/60		32
G11B5/6058	13	{using piezoelectric means}	G11B5/60	G11B5/60		79
G11B5/6064	13	{using air pressure}	G11B5/60	G11B5/60		441
G11B5/607	13	{using thermal means}	G11B5/60	G11B5/60		588
G11B5/6076	13	{Detecting head-disk contact}	G11B5/60	G11B5/60		296
G11B5/6082	12	{Design of the air bearing surface}	G11B5/60	G11B5/60		563
G11B5/6088	12	{Optical waveguide in or on flying head}	G11B5/60	G11B5/60		823
G11B5/6094	12	{Preventing or discharging electrostatic charge build-up on the flying head}	G11B5/60	G11B5/60		21
G11B5/62	8	Record carriers characterised by the selection of the material<br><br><u>NOTE</u><br><br>This group does not cover compositions, materials or processes, per se, which are covered by the relevant subclasses of section B or C.	G11B5/62	G11B5/62		604
G11B5/627	9	of leaders for magnetic tapes, e.g. non-magnetic strips on the tapes or for connection	G11B5/627	G11B5/627		51
G11B5/633	9	of cinematographic films or slides with integral magnetic track	G11B5/633	G11B5/633		192
G11B5/64	9	comprising only the magnetic material without bonding agent	G11B5/64	G11B5/64		264
G11B5/642	10	{self supporting magnetic material, e.g. magnetisable wires}	G11B5/64	G11B5/64		56
G11B5/65	10	characterised by its composition (G11B5/66 takes precedence)	G11B5/65	G11B5/65		145
G11B5/653	11	{containing Fe or Ni (containing Co G11B5/656; containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658)}	G11B5/65	G11B5/65		101
G11B5/656	11	{containing Co (containing inorganic, non-oxide compounds of Si, N, P, B, H or C G11B5/657; containing oxygen G11B5/658)}	G11B5/65	G11B5/65		353
G11B5/657	11	{containing inorganic, non-oxide compound of Si, N, P, B, H or C, e.g. in metal alloy or compound (containing oxygen G11B5/658)}	G11B5/65	G11B5/65		314
G11B5/658	11	{containing oxygen, e.g. molecular oxygen or magnetic oxide}	G11B5/65	G11B5/65		538
G11B5/66	10	the record carriers consisting of several layers	G11B5/66	G11B5/66		257
G11B5/667	11	including a soft magnetic layer	G11B5/667	G11B5/667		356
G11B5/672	11	{having different compositions in a plurality of magnetic layers, e.g. layer compositions having differing elemental components or differing proportions of elements}	G11B5/66	G11B5/672		561
G11B5/674	11	{having differing macroscopic or microscopic structures, e.g. differing crystalline lattices, varying atomic structures or differing roughnesses}	G11B5/66	G11B5/674		163
G11B5/676	11	{having magnetic layers separated by a nonmagnetic layer, e.g. antiferromagnetic layer, Cu layer or coupling layer}	G11B5/66	G11B5/676		423
G11B5/678	12	{having three or more magnetic layers}	G11B5/66	G11B5/678		279
G11B5/68	9	comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent	G11B5/68	G11B5/68		99
G11B5/70	10	on a base layer	G11B5/70	G11B5/70		918
G11B5/7013	11	{characterised by the dispersing agent}	G11B5/70	G11B5/70		260
G11B5/702	11	characterised by the bonding agent	G11B5/702	G11B5/702		319
G11B5/7021	12	{containing a polyurethane or a polyisocyanate}	G11B5/702	G11B5/702		445
G11B5/7022	13	{containing mixtures of polyurethanes or polyisocyanates with other polymers}	G11B5/702	G11B5/702		439
G11B5/7023	12	{containing polyesters, polyethers, silicones, polyvinyl resins, polyacrylresins or epoxy resins (G11B5/7022 takes precedence)}	G11B5/702	G11B5/702		503
G11B5/7025	12	{containing cellulosic derivates (G11B5/7022 takes precedence)}	G11B5/702	G11B5/702		28
G11B5/7026	12	{Radiation curable polymers}	G11B5/702	G11B5/702		161
G11B5/7027	12	{Graft polymers}	G11B5/702	G11B5/702		16
G11B5/7028	12	{Additives, e.g. crosslinking agents}	G11B5/702	G11B5/702		135
G11B5/706	11	characterised by the composition of the magnetic material	G11B5/706	G11B5/706		251
G11B5/70605	12	{metals or alloys}	G11B5/706	G11B5/706		143
G11B5/7061	13	{with a non-magnetic core}	G11B5/706	G11B5/706		12
G11B5/70615	13	{containing Fe metal or alloys (G11B5/70621 takes precedence)}	G11B5/706	G11B5/706		247
G11B5/70621	13	{containing Co metal or alloys}	G11B5/706	G11B5/706		205
G11B5/70626	12	{containing non-metallic substances}	G11B5/706	G11B5/706		112
G11B5/70631	13	{with a non-magnetic core}	G11B5/706	G11B5/706		15
G11B5/70636	13	{CrO2}	G11B5/706	G11B5/706		209
G11B5/70642	13	{iron oxides}	G11B5/706	G11B5/706		235
G11B5/70647	14	{with a skin (G11B5/70657 takes precedence)}	G11B5/706	G11B5/706		161
G11B5/70652	14	{gamma - Fe2 O3}	G11B5/706	G11B5/706		169
G11B5/70657	15	{with a skin}	G11B5/706	G11B5/706		58
G11B5/70663	15	{Preparation processes specially adapted therefor, e.g. using stabilising agents (G11B5/70668 and G11B5/70673 take precedence)}	G11B5/706	G11B5/706		79
G11B5/70668	15	{containing a dopant}	G11B5/706	G11B5/706		49
G11B5/70673	16	{containing Co}	G11B5/706	G11B5/706		150
G11B5/70678	14	{Ferrites}	G11B5/706	G11B5/706		620
G11B5/70684	15	{Ferro-ferrioxydes}	G11B5/706	G11B5/706		47
G11B5/70689	16	{Magnetite}	G11B5/706	G11B5/706		87
G11B5/70694	16	{Non-stoechiometric ferro-ferrioxydes, e.g. berthollide}	G11B5/706	G11B5/706		48
G11B5/708	11	characterised by addition of non-magnetic particles to the layer	G11B5/708	G11B5/708		410
G11B5/7085	12	{non-magnetic abrasive particles}	G11B5/708	G11B5/708		283
G11B5/71	11	characterised by the lubricant	G11B5/71	G11B5/71		671
G11B5/712	11	characterised by the surface treatment or coating of magnetic particles	G11B5/712	G11B5/712		496
G11B5/714	11	characterised by the dimension of the magnetic particles	G11B5/714	G11B5/714		591
G11B5/716	11	characterised by two or more magnetic layers	G11B5/716	G11B5/716		411
G11B5/718	12	at least one on each side of the base layer	G11B5/718	G11B5/718		51
G11B5/72	9	Protective coatings, e.g. anti-static {or antifriction}	G11B5/72	G11B5/72		467
G11B5/722	10	{containing an anticorrosive material}	G11B5/72	G11B5/72		196
G11B5/725	10	containing a lubricant {, e.g. organic compounds (inorganic carbon protective coating G11B5/727)}	G11B5/725	G11B5/725		367
G11B5/7253	11	{Fluorocarbon lubricant}	G11B5/725	G11B5/725		167
G11B5/7257	12	{Perfluoropolyether lubricant}	G11B5/725	G11B5/725		453
G11B5/726	10	{Two or more protective coatings (inorganic carbon protective coating G11B5/727)}	G11B5/72	G11B5/72		60
G11B5/7262	11	{Inorganic protective coating}	G11B5/72	G11B5/72		79
G11B5/7264	12	{Inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon}	G11B5/72	G11B5/72		60
G11B5/7266	13	{comprising a lubricant over the inorganic carbon coating}	G11B5/72	G11B5/72		172
G11B5/7268	13	{comprising elemental nitrogen in the inorganic carbon coating}	G11B5/72	G11B5/72		33
G11B5/727	10	{Inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon}	G11B5/72	G11B5/72		150
G11B5/728	10	{containing a bonding agent in the protective coating}	G11B5/72	G11B5/72		10
G11B5/73	9	Base layers {, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer}	G11B5/73	G11B5/73		371
G11B5/733	10	characterised by the addition of non-magnetic particles {(base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739)}<br><br><u>NOTE</u><br><br>This subgroup covers:  non-magnetic base layer structures characterised by the addition of non-magnetic particles.<br>This subgroup does not cover:  magnetic layer structures comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent (even when also containing non-magnetic particles), which are covered by G11B5/68 (in particular, G11B5/708 and  G11B5/7085).	G11B5/733	G11B5/733		445
G11B5/7334	11	{Base layer characterised by composition or structure}	G11B5/733	G11B5/733		150
G11B5/735	10	characterised by the back layer {(magnetic recording media substrates G11B5/739)}	G11B5/735	G11B5/735		341
G11B5/7353	11	{for a thin film medium where the magnetic recording layer structure has no bonding agent}	G11B5/735	G11B5/735		10
G11B5/7356	11	{comprising non-magnetic particles in the back layer, e.g. particles of TiO2, ZnO or SiO2}	G11B5/735	G11B5/735		359
G11B5/7358	12	{specially adapted for achieving a specific property, e.g. average roughness [Ra]}	G11B5/735	G11B5/735		165
G11B5/736	10	{Non-magnetic layer under a soft magnetic layer, e.g. between a substrate and a soft magnetic underlayer [SUL] or a keeper layer (magnetic recording media substrates G11B5/739)}	G11B5/73	G11B5/73		84
G11B5/7361	11	{Two or more non-magnetic layers}	G11B5/73	G11B5/73		15
G11B5/7362	12	{Physical structure of underlayer, e.g. texture}	G11B5/73	G11B5/73		3
G11B5/7363	11	{Non-magnetic single underlayer comprising nickel}	G11B5/73	G11B5/73		14
G11B5/7364	11	{Non-magnetic single underlayer comprising chromium}	G11B5/73	G11B5/73		15
G11B5/7365	11	{Non-magnetic single underlayer comprising a polymeric structure, e.g. polymeric adhesion layer or plasma-polymerized carbon layer}	G11B5/73	G11B5/73		5
G11B5/7366	11	{for heat-assisted or thermally-assisted magnetic recording [HAMR, TAMR]}	G11B5/73	G11B5/73		18
G11B5/7367	11	{Physical structure of underlayer, e.g. texture}	G11B5/73	G11B5/73		4
G11B5/7368	10	{Non-polymeric layer under the lowermost magnetic recording layer (base layers having a non-magnetic layer under a soft magnetic layer G11B5/736; magnetic recording media substrates G11B5/739)}	G11B5/73	G11B5/73		435
G11B5/7369	11	{Two or more non-magnetic underlayers, e.g. seed layers or barrier layers}	G11B5/73	G11B5/73		512
G11B5/737	12	{Physical structure of underlayer, e.g. texture}	G11B5/73	G11B5/73		368
G11B5/7371	11	{Non-magnetic single underlayer comprising nickel}	G11B5/73	G11B5/73		107
G11B5/7373	11	{Non-magnetic single underlayer comprising chromium}	G11B5/73	G11B5/73		232
G11B5/7375	11	{for heat-assisted or thermally-assisted magnetic recording [HAMR, TAMR]}	G11B5/73	G11B5/73		83
G11B5/7377	11	{Physical structure of underlayer, e.g. texture}	G11B5/73	G11B5/73		185
G11B5/7379	11	{Seed layer, e.g. at least one non-magnetic layer is specifically adapted as a seed or seeding layer}	G11B5/73	G11B5/73		382
G11B5/739	10	{Magnetic recording media substrates}	G11B5/73	G11B5/73		69
G11B5/73911	11	{Inorganic substrates}	G11B5/73	G11B5/73		119
G11B5/73913	12	{Composites or coated substrates}	G11B5/73	G11B5/73		240
G11B5/73915	13	{Silicon compound based coating}	G11B5/73	G11B5/73		39
G11B5/73917	12	{Metallic substrates, i.e. elemental metal or metal alloy substrates}	G11B5/73	G11B5/73		85
G11B5/73919	13	{Aluminium or titanium elemental or alloy substrates}	G11B5/73	G11B5/73		383
G11B5/73921	12	{Glass or ceramic substrates}	G11B5/73	G11B5/73		736
G11B5/73923	11	{Organic polymer substrates}	G11B5/73	G11B5/73		365
G11B5/73925	12	{Composite or coated non-esterified substrates}	G11B5/73	G11B5/73		39
G11B5/73927	12	{Polyester substrates, e.g. polyethylene terephthalate}	G11B5/73	G11B5/73		416
G11B5/73929	13	{comprising naphthalene ring compounds, e.g. polyethylene naphthalate substrates}	G11B5/73	G11B5/73		210
G11B5/73931	13	{Two or more layers, at least one layer being polyester}	G11B5/73	G11B5/73		155
G11B5/73933	13	{Surface treated layers, e.g. treated by corona discharge}	G11B5/73	G11B5/73		13
G11B5/73935	13	{characterised by roughness or surface features, e.g. by added particles}	G11B5/73	G11B5/73		157
G11B5/73937	12	{Substrates having an organic polymer comprising a ring structure}	G11B5/73	G11B5/73		141
G11B5/74	8	Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum	G11B5/74	G11B5/74		662
G11B5/743	9	{Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks}	G11B5/74	G11B5/74		814
G11B5/746	10	{Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit}	G11B5/74	G11B5/74		367
G11B5/76	9	Drum carriers	G11B5/76	G11B5/76		97
G11B5/78	9	Tape carriers	G11B5/78	G11B5/78		602
G11B5/80	9	Card carriers	G11B5/80	G11B5/80		97
G11B5/82	9	Disk carriers	G11B5/82	G11B5/82		1817
G11B5/825	10	{flexible discs}	G11B5/82	G11B5/82		195
G11B5/84	8	Processes or apparatus specially adapted for manufacturing record carriers	G11B5/84	G11B5/84		1949
G11B5/8404	9	{manufacturing base layers}	G11B5/84	G11B5/84		1492
G11B5/8408	9	{protecting the magnetic layer}	G11B5/84	G11B5/84		518
G11B5/8412	9	{treatment by ultrasonics}	G11B5/84	G11B5/84		21
G11B5/8416	9	{coating a support with a magnetic layer by precipitation}	G11B5/84	G11B5/84		24
G11B5/842	9	Coating a support with a liquid magnetic dispersion	G11B5/842	G11B5/842		384
G11B5/845	10	in a magnetic field	G11B5/845	G11B5/845		270
G11B5/848	9	Coating a support with a magnetic layer by extrusion	G11B5/848	G11B5/848		168
G11B5/85	9	Coating a support with a magnetic layer by vapour deposition	G11B5/85	G11B5/85		516
G11B5/851	9	Coating a support with a magnetic layer by sputtering	G11B5/851	G11B5/851		947
G11B5/852	9	Orientation in a magnetic field (G11B5/845 takes precedence)	G11B5/852	G11B5/852		119
G11B5/855	9	Coating only part of a support with a magnetic layer	G11B5/855	G11B5/855		1301
G11B5/858	9	Producing a magnetic layer by electro-plating or electroless plating	G11B5/858	G11B5/858		147
G11B5/86	8	Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers {(by varying the order of the information G11B27/029, G11B27/036)}	G11B5/86	G11B5/86		734
G11B5/865	9	{by contact "printing"}	G11B5/86	G11B5/86		697
G11B7/00	7	Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation {by modifying optical properties or the physical structure}, reproducing using an optical beam at lower power {by sensing optical properties}; Record carriers therefor (G11B11/00, G11B13/00 take precedence)	G11B7/00	G11B7/00		3890
G11B2007/0003	8	{Recording, reproducing or erasing systems characterised by the structure or type of the carrier}	G11B7/00	G11B7/00		56
G11B2007/0006	9	{adapted for scanning different types of carrier, e.g. CD &amp; DVD}	G11B7/00	G11B7/00		2550
G11B2007/0009	9	{for carriers having data stored in three dimensions, e.g. volume storage}	G11B7/00	G11B7/00		178
G11B2007/0013	10	{for carriers having multiple discrete layers}	G11B7/00	G11B7/00		1612
G11B2007/0016	9	{for carriers adapted to have label information written on the non-data side by the optical head used for data recording, e.g. lightscribe, labelflash}	G11B7/00	G11B7/00		51
G11B7/002	8	Recording, reproducing or erasing systems characterised by the shape {or form} of the carrier	G11B7/002	G11B7/002		21
G11B7/0025	9	with cylinders or cylinder-like carriers {or cylindrical sections or flat carriers loaded onto a cylindrical surface}, e.g. truncated cones	G11B7/0025	G11B7/0025		134
G11B7/003	9	with webs {, filaments or wires}, e.g. belts, spooled tapes or films of quasi-infinite extent	G11B7/003	G11B7/003		366
G11B7/0031	10	{using a rotating head, e.g. helicoidal recording}	G11B7/003	G11B7/003		94
G11B7/0032	10	{for moving-picture soundtracks, i.e. cinema (cameras or projectors with sound recording or reproducing means G03B31/02)}	G11B7/003	G11B7/003		194
G11B7/0033	9	with cards {or other card-like flat carriers, e.g. flat sheets of optical film}	G11B7/0033	G11B7/0033		701
G11B7/0037	9	with discs	G11B7/0037	G11B7/0037		1584
G11B7/00375	10	{arrangements for detection of physical defects, e.g. of recording layer}	G11B7/0037	G11B7/0037		460
G11B7/004	8	Recording, reproducing or erasing methods; Read, write or erase circuits therefor {(magneto-optical systems G11B11/105)}	G11B7/004	G11B7/004		1004
G11B7/0045	9	Recording (G11B7/006, G11B7/0065 take precedence)	G11B7/0045	G11B7/0045		2503
G11B7/00451	10	{involving ablation of the recording layer}	G11B7/0045	G11B7/0045		139
G11B7/00452	10	{involving bubble or bump forming}	G11B7/0045	G11B7/0045		169
G11B7/00453	10	{involving spectral or photochemical hole burning}	G11B7/0045	G11B7/0045		82
G11B7/00454	10	{involving phase-change effects}	G11B7/0045	G11B7/0045		620
G11B7/00455	10	{involving reflectivity, absorption or colour changes}	G11B7/0045	G11B7/0045		461
G11B7/00456	10	{Recording strategies, e.g. pulse sequences (G11B7/0062 takes precedence)}	G11B7/0045	G11B7/0045		807
G11B2007/00457	10	{Two photon recording}	G11B7/0045	G11B7/0045		26
G11B7/00458	10	{Verification, i.e. checking data during or after recording}	G11B7/0045	G11B7/0045		237
G11B7/005	9	Reproducing (G11B7/0065 takes precedence)	G11B7/005	G11B7/005		2346
G11B7/0051	10	{involving phase depth effects}	G11B7/005	G11B7/005		80
G11B7/0052	10	{involving reflectivity, absorption or colour changes}	G11B7/005	G11B7/005		235
G11B7/0053	10	{Reproducing non-user data, e.g. wobbled address, prepits, BCA}	G11B7/005	G11B7/005		746
G11B7/0055	9	Erasing (G11B7/006, G11B7/0065 take precedence)	G11B7/0055	G11B7/0055		251
G11B7/00552	10	{involving colour change media}	G11B7/0055	G11B7/0055		40
G11B7/00555	10	{involving liquid crystal media}	G11B7/0055	G11B7/0055		56
G11B7/00557	10	{involving phase-change media}	G11B7/0055	G11B7/0055		231
G11B7/006	9	Overwriting (G11B7/0065 takes precedence)	G11B7/006	G11B7/006		364
G11B7/0062	10	{Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media}	G11B7/006	G11B7/006		571
G11B7/0065	9	Recording, reproducing or erasing by using optical interference patterns, e.g. holograms	G11B7/0065	G11B7/0065		2270
G11B2007/00653	10	{Collinear holography}	G11B7/0065	G11B7/0065		11
G11B2007/00656	10	{Counterpropagating holography}	G11B7/0065	G11B7/0065		15
G11B7/007	8	Arrangement of the information on the record carrier, e.g. form of tracks {, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track}	G11B7/007	G11B7/007		1890
G11B2007/00709	9	{Dimensions of grooves or tracks, e.g. groove depth, track pitch}	G11B7/007	G11B7/007		97
G11B7/00718	9	{Groove and land recording, i.e. user data recorded both in the grooves and on the lands}	G11B7/007	G11B7/007		809
G11B2007/00727	9	{where the information is modified to form a visible pattern, e.g. forming a label by modifying the width of pits or grooves}	G11B7/007	G11B7/007		23
G11B7/00736	9	{Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information (sector headers or adresses in prepits G11B7/00745; address data in track wobble G11B7/24082)}	G11B7/007	G11B7/007		1881
G11B7/00745	9	{Sectoring or header formats within a track (formats in general G11B20/12)}	G11B7/007	G11B7/007		1065
G11B2007/00754	9	{Track shape, e.g. address or synchronisation information in wobbled track or sidewall}	G11B7/007	G11B7/007		74
G11B2007/00763	9	{Track cross-section, e.g. V-shaped, trapezoidal}	G11B7/007	G11B7/007		5
G11B7/00772	9	{on record carriers storing information in the form of optical interference patterns, e.g. holograms}	G11B7/007	G11B7/007		202
G11B7/00781	10	{Auxiliary information, e.g. index marks, address marks, pre-pits, gray codes}	G11B7/007	G11B7/007		266
G11B7/0079	9	{Zoned data area, e.g. having different data structures or formats for the user data within data layer, Zone Constant Linear Velocity [ZCLV], Zone Constant Angular Velocity [ZCAV], carriers with RAM and ROM areas}	G11B7/007	G11B7/007		534
G11B7/013	9	for discrete information, i.e. where each information unit is stored in a distinct discrete location {, e.g. digital information formats within a data block or sector}	G11B7/013	G11B7/013		464
G11B2007/0133	10	{Details of discrete information structures, e.g. shape or dimensions of pits, prepits}	G11B7/013	G11B7/013		38
G11B2007/0136	10	{where each location can have more than two values (&apos;multivalue&apos;), for data or prepits}	G11B7/013	G11B7/013		21
G11B7/08	8	Disposition or mounting of heads or light sources relatively to record carriers	G11B7/08	G11B7/08		1554
G11B7/081	9	{for time base error correction by moving the light beam}	G11B7/08	G11B7/08		87
G11B7/082	9	{Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head}	G11B7/08	G11B7/08		306
G11B7/083	9	{relative to record carriers storing information in the form of optical interference patterns, e.g. holograms}	G11B7/08	G11B7/08		347
G11B7/085	9	with provision for moving the light beam into, or out of, its operative position {or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection}	G11B7/085	G11B7/085		1086
G11B7/08505	10	{Methods for track change, selection or preliminary positioning by moving the head}	G11B7/085	G11B7/085		888
G11B7/08511	11	{with focus pull-in only}	G11B7/085	G11B7/085		542
G11B7/08517	11	{with tracking pull-in only}	G11B7/085	G11B7/085		546
G11B7/08523	11	{with both tracking and focusing pull-in}	G11B7/085	G11B7/085		108
G11B7/08529	11	{Methods and circuits to control the velocity of the head as it traverses the tracks}	G11B7/085	G11B7/085		443
G11B7/08535	12	{to maintain constant velocity during the traverse}	G11B7/085	G11B7/085		50
G11B7/08541	11	{involving track counting to determine position}	G11B7/085	G11B7/085		444
G11B7/08547	10	{Arrangements for positioning the light beam only without moving the head, e.g. using static electro-optical elements}	G11B7/085	G11B7/085		144
G11B7/08552	11	{using electro-optical elements}	G11B7/085	G11B7/085		16
G11B7/08558	11	{using acousto-optical elements}	G11B7/085	G11B7/085		17
G11B7/08564	11	{using galvanomirrors}	G11B7/085	G11B7/085		341
G11B7/0857	10	{Arrangements for mechanically moving the whole head}	G11B7/085	G11B7/085		245
G11B7/08576	11	{Swinging-arm positioners}	G11B7/085	G11B7/085		320
G11B7/08582	11	{Sled-type positioners}	G11B7/085	G11B7/085		1183
G11B7/08588	12	{with position sensing by means of an auxiliary system using an external scale}	G11B7/085	G11B7/085		117
G11B7/08594	11	{to access both sides of the disc with the same head assembly}	G11B7/085	G11B7/085		64
G11B7/09	9	with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following	G11B7/09	G11B7/09		1944
G11B7/0901	10	{for track following only (G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence)}	G11B7/09	G11B7/09		1540
G11B7/0903	11	{Multi-beam tracking systems}	G11B7/09	G11B7/09		856
G11B7/0904	11	{Dithered tracking systems}	G11B7/09	G11B7/09		102
G11B7/0906	11	{Differential phase difference systems}	G11B7/09	G11B7/09		253
G11B7/0908	10	{for focusing only (G11B7/0925, G11B7/094, G11B7/0941, G11B7/0943, G11B7/0945, G11B7/0946, G11B7/0948 take precedence)}	G11B7/09	G11B7/09		1614
G11B7/0909	11	{by astigmatic methods}	G11B7/09	G11B7/09		452
G11B7/0911	11	{by far-field method}	G11B7/09	G11B7/09		1
G11B7/0912	11	{by push-pull method}	G11B7/09	G11B7/09		308
G11B7/0914	11	{by non-optical methods, e.g. capacitive}	G11B7/09	G11B7/09		28
G11B7/0916	11	{Foucault or knife-edge methods}	G11B7/09	G11B7/09		260
G11B7/0917	11	{Focus-error methods other than those covered by G11B7/0909&#160;-&#160;G11B7/0916}	G11B7/09	G11B7/09		307
G11B2007/0919	12	{Critical angle methods}	G11B7/09	G11B7/09		36
G11B2007/092	12	{Dither methods}	G11B7/09	G11B7/09		3
G11B2007/0922	12	{Far-field methods}	G11B7/09	G11B7/09		1
G11B2007/0924	12	{Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90&#176;)}	G11B7/09	G11B7/09		38
G11B7/0925	10	{Electromechanical actuators for lens positioning (G11B7/0857 takes precedence)}	G11B7/09	G11B7/09		295
G11B7/0927	11	{for focusing only (G11B7/0937 takes precedence)}	G11B7/09	G11B7/09		231
G11B7/0929	11	{for tracking only (G11B7/0937 takes precedence)}	G11B7/09	G11B7/09		150
G11B7/093	11	{for focusing and tracking (G11B7/0932&#160;-&#160;G11B7/0937 take precedence)}	G11B7/09	G11B7/09		771
G11B7/0932	11	{Details of sprung supports}	G11B7/09	G11B7/09		1031
G11B7/0933	11	{Details of stationary parts}	G11B7/09	G11B7/09		975
G11B7/0935	11	{Details of the moving parts}	G11B7/09	G11B7/09		1283
G11B7/0937	11	{Piezoelectric actuators}	G11B7/09	G11B7/09		170
G11B7/0938	10	{servo format, e.g. guide tracks, pilot signals}	G11B7/09	G11B7/09		1106
G11B7/094	10	{Methods and circuits for servo offset compensation}	G11B7/09	G11B7/09		1066
G11B7/0941	10	{Methods and circuits for servo gain or phase compensation during operation (for initialising servos G11B7/0945)}	G11B7/09	G11B7/09		800
G11B7/0943	10	{Methods and circuits for performing mathematical operations on individual detector segment outputs}	G11B7/09	G11B7/09		626
G11B7/0945	10	{Methods for initialising servos, start-up sequences}	G11B7/09	G11B7/09		1023
G11B7/0946	10	{specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration}	G11B7/09	G11B7/09		545
G11B7/0948	10	{specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts (G11B7/095 takes precedence)}	G11B7/09	G11B7/09		562
G11B7/095	10	specially adapted for discs, e.g. for compensation of eccentricity or wobble	G11B7/095	G11B7/095		393
G11B7/0953	11	{to compensate for eccentricity of the disc or disc tracks}	G11B7/095	G11B7/095		557
G11B7/0956	11	{to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc}	G11B7/095	G11B7/095		1649
G11B7/10	9	Interchangeable mountings, e.g. for replacement of head without readjustment {including interchangeable electrical adjuster boards}	G11B7/10	G11B7/10		25
G11B7/12	8	Heads, e.g. forming of the optical beam spot or modulation of the optical beam (disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method G11B7/08{; modulating lasers H01S3/10; controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching gating or modulating G02F1/00})	G11B7/12	G11B7/12		1004
G11B7/121	9	Protecting the head, e.g. against dust or impact with the record carrier	G11B7/121	G11B7/121		639
G11B7/122	9	Flying-type heads, e.g. analogous to Winchester type in magnetic recording	G11B7/122	G11B7/122		473
G11B7/123	9	Integrated head arrangements, e.g. with source and detectors mounted on the same substrate	G11B7/123	G11B7/123		790
G11B7/124	10	the integrated head arrangements including waveguides	G11B7/124	G11B7/124		198
G11B7/1245	11	the waveguides including means for electro-optical or acousto-optical deflection	G11B7/1245	G11B7/1245		53
G11B7/125	9	Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces	G11B7/125	G11B7/125		380
G11B7/126	10	Circuits, methods or arrangements for laser control or stabilisation	G11B7/126	G11B7/126		1839
G11B7/1263	11	Power control during transducing, e.g. by monitoring	G11B7/1263	G11B7/1263		1135
G11B7/1267	11	Power calibration	G11B7/1267	G11B7/1267		1051
G11B7/127	10	Lasers; Multiple laser arrays {(lasers per seH01S)}	G11B7/127	G11B7/127		1377
G11B7/1275	11	Two or more lasers having different wavelengths	G11B7/1275	G11B7/1275		1201
G11B7/128	10	Modulators (G11B7/1245 takes precedence)	G11B7/128	G11B7/128		543
G11B7/13	9	Optical detectors therefor	G11B7/13	G11B7/13		1206
G11B7/131	10	Arrangement of detectors in a multiple array	G11B7/131	G11B7/131		1184
G11B7/133	10	Shape of individual detector elements	G11B7/133	G11B7/133		297
G11B7/135	9	Means for guiding the beam from the source to the record carrier or from the record carrier to the detector	G11B7/135	G11B7/135		492
G11B7/1353	10	Diffractive elements, e.g. holograms or gratings {(diffraction gratings per seG02B5/18; holograms per seG02B5/32; grating systems G02B27/44)}	G11B7/1353	G11B7/1353		2750
G11B7/1356	10	Double or multiple prisms, i.e. having two or more prisms in cooperation	G11B7/1356	G11B7/1356		749
G11B7/1359	10	Single prisms	G11B7/1359	G11B7/1359		539
G11B7/1362	10	Mirrors	G11B7/1362	G11B7/1362		1039
G11B7/1365	10	Separate or integrated refractive elements, e.g. wave plates<br><br><u>NOTE</u><br><br>In this group, integrated combinations of a refractive element, such as a coating element or phase plate, with another element, such as a lens, are classified in this group and in other appropriate groups for the other element.	G11B7/1365	G11B7/1365		859
G11B7/1367	11	Stepped phase plates	G11B7/1367	G11B7/1367		343
G11B7/1369	11	Active plates, e.g. liquid crystal panels or electrostrictive elements	G11B7/1369	G11B7/1369		702
G11B7/1372	10	Lenses	G11B7/1372	G11B7/1372		631
G11B2007/13722	11	{Fresnel lenses}	G11B7/1372	G11B7/1372		53
G11B2007/13725	11	{Catadioptric lenses, i.e. having at least one internal reflective surface}	G11B7/1372	G11B7/1372		56
G11B2007/13727	11	{Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing}	G11B7/1372	G11B7/1372		854
G11B7/1374	11	Objective lenses {(optical objectives per seG02B9/00)}	G11B7/1374	G11B7/1374		2794
G11B7/1376	11	Collimator lenses {(collimators per seG02B27/30)}	G11B7/1376	G11B7/1376		648
G11B7/1378	11	Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders	G11B7/1378	G11B7/1378		738
G11B7/1381	10	Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops (G11B7/1353 - G11B7/1369 take precedence)	G11B7/1381	G11B7/1381		1069
G11B7/1384	10	Fibre optics	G11B7/1384	G11B7/1384		283
G11B7/1387	10	using the near-field effect	G11B7/1387	G11B7/1387		739
G11B7/139	10	Numerical aperture control means	G11B7/139	G11B7/139		367
G11B7/1392	10	Means for controlling the beam wavefront, e.g. for correction of aberration {(optical systems for aberration correction per seG02B27/00)}	G11B7/1392	G11B7/1392		234
G11B7/13922	11	{passive}	G11B7/1392	G11B7/1392		668
G11B7/13925	11	{active, e.g. controlled by electrical or mechanical means}	G11B7/1392	G11B7/1392		556
G11B7/13927	12	{during transducing, e.g. to correct for variation of the spherical aberration due to disc tilt or irregularities in the cover layer thickness}	G11B7/1392	G11B7/1392		408
G11B7/1395	10	Beam splitters or combiners (G11B7/1353, G11B7/1356 take precedence {; beam splitting or combining per seG02B27/10})	G11B7/1395	G11B7/1395		958
G11B7/1398	10	Means for shaping the cross-section of the beam, e.g. into circular or elliptical cross-section	G11B7/1398	G11B7/1398		333
G11B7/14	9	specially adapted to record on, or to reproduce from, more than one track simultaneously	G11B7/14	G11B7/14		883
G11B7/22	9	Apparatus or processes for the manufacture of optical heads, e.g. assembly	G11B7/22	G11B7/22		1424
G11B7/24	8	Record carriers characterised by shape, structure or physical properties, or by the selection of the material (characterised by the arrangement of information on the carrier G11B7/007)	G11B7/24	G11B7/24		2962
G11B2007/240004	9	{characterised by the form of the carrier}	G11B7/24	G11B7/24		8
G11B2007/240008	10	{Cards}	G11B7/24	G11B7/24		6
G11B2007/240012	11	{intended for rotation}	G11B7/24	G11B7/24		7
G11B2007/240017	10	{Tapes}	G11B7/24	G11B7/24		7
G11B2007/240021	10	{Cylinders}	G11B7/24	G11B7/24		
G11B2007/240025	9	{for storing optical interference patterns, e.g. holograms}	G11B7/24	G11B7/24		55
G11B7/24003	9	Shapes of record carriers other than disc shape	G11B7/24003	G11B7/24003		73
G11B7/24006	10	Cylindrical or shaft-shaped	G11B7/24006	G11B7/24006		19
G11B7/24009	10	Tapes, long films or long sheets	G11B7/24009	G11B7/24009		52
G11B7/24012	10	Optical cards	G11B7/24012	G11B7/24012		108
G11B7/24015	9	Air-sandwiched discs<br><br><u>NOTE</u><br><br> When classifying in this group, classification is also made in group G11B7/2403 if the subject matter disclosed in the context of an air-sandwiched disc is of more general application 	G11B7/24015	G11B7/24015		74
G11B7/24018	9	Laminated discs (G11B7/24015 takes precedence)<br><br><u>NOTE</u><br><br> When classifying in this group, classification is also made in group G11B7/2403 if the subject matter disclosed in the context of a laminated disc is of more general application 	G11B7/24018	G11B7/24018		63
G11B7/24021	10	provided with a special shape or structure for centering or eccentricity prevention, e.g. alignment	G11B7/24021	G11B7/24021		29
G11B7/24024	10	Adhesion or bonding, e.g. specific adhesive layers	G11B7/24024	G11B7/24024		91
G11B7/24027	10	Layers; Shape, structure or physical properties thereof (G11B7/24021, G11B7/24024 take precedence)	G11B7/24027	G11B7/24027		196
G11B7/2403	9	Layers; Shape, structure or physical properties thereof	G11B7/2403	G11B7/2403		365
G11B7/24033	10	Electrode layers	G11B7/24033	G11B7/24033		16
G11B7/24035	10	Recording layers (substrates also used as recording layers G11B7/24047)	G11B7/24035	G11B7/24035		197
G11B7/24038	11	Multiple laminated recording layers	G11B7/24038	G11B7/24038		1756
G11B7/24041	12	with different recording characteristics	G11B7/24041	G11B7/24041		58
G11B7/24044	11	for storing optical interference patterns, e.g. holograms; for storing data in three dimensions [3D], e.g. volume storage (G11B7/24038 takes precedence)	G11B7/24044	G11B7/24044		651
G11B7/24047	10	Substrates	G11B7/24047	G11B7/24047		217
G11B7/2405	11	being also used as track layers of pre-formatted layers (tracks or pits G11B7/2407)	G11B7/2405	G11B7/2405		132
G11B7/24053	10	Protective topcoat layers lying opposite to the light entrance side, e.g. layers for preventing electrostatic charging	G11B7/24053	G11B7/24053		90
G11B7/24056	10	Light transmission layers lying on the light entrance side and being thinner than the substrate, e.g. specially adapted for Blu-ray&#174; discs	G11B7/24056	G11B7/24056		143
G11B7/24059	11	specially adapted for near-field recording or reproduction	G11B7/24059	G11B7/24059		29
G11B7/24062	10	Reflective layers	G11B7/24062	G11B7/24062		169
G11B7/24065	10	Layers assisting in recording or reproduction below the optical diffraction limit, e.g. non-linear optical layers or structures (cover layers for near-field media G11B7/24059)	G11B7/24065	G11B7/24065		87
G11B7/24067	10	Combinations of two or more layers with specific interrelation	G11B7/24067	G11B7/24067		158
G11B7/2407	9	Tracks or pits; Shape, structure or physical properties thereof (layout of tracks or pits used as the identification information G11B7/007)	G11B7/2407	G11B7/2407		49
G11B7/24073	10	Tracks	G11B7/24073	G11B7/24073		105
G11B7/24076	11	Cross sectional shape in the radial direction of a disc, e.g. asymmetrical cross sectional shape	G11B7/24076	G11B7/24076		128
G11B7/24079	11	Width or depth (G11B7/24076 takes precedence)	G11B7/24079	G11B7/24079		540
G11B7/24082	11	Meandering	G11B7/24082	G11B7/24082		538
G11B7/24085	10	Pits	G11B7/24085	G11B7/24085		1235
G11B7/24088	11	for storing more than two values, i.e. multi-valued recording for data or prepits	G11B7/24088	G11B7/24088		206
G11B7/24091	10	Combinations of pits and tracks with specific interrelation	G11B7/24091	G11B7/24091		14
G11B7/24094	9	Indication parts or information parts for identification	G11B7/24094	G11B7/24094		284
G11B7/24097	9	Structures for detection, control, recording operation or replay operation; Special shapes or structures for centering or eccentricity prevention (within laminated discs G11B7/24021); Arrangements for testing, inspecting or evaluating; Containers, cartridges or cassettes<br><br><u>NOTE</u><br><br> When classifying in this group, classification is also made in group G11B23/00 if the subject matter disclosed in the context of an optical record carrier is of more general application 	G11B7/24097	G11B7/24097		233
G11B7/241	9	characterised by the selection of the material	G11B7/241	G11B7/241		511
G11B7/242	10	of recording layers	G11B7/242	G11B7/242		120
G11B7/243	11	comprising inorganic materials only, e.g. ablative layers	G11B7/243	G11B7/243		1845
G11B2007/24302	12	{Metals or metalloids}	G11B7/243	G11B7/243		34
G11B2007/24304	13	{group 2 or 12 elements (e.g. Be, Ca, Mg, Zn, Cd)}	G11B7/243	G11B7/243		358
G11B2007/24306	13	{transition metal elements of groups 3-10}	G11B7/243	G11B7/243		570
G11B2007/24308	13	{transition metal elements of group 11 (Cu, Ag, Au)}	G11B7/243	G11B7/243		590
G11B2007/2431	13	{group 13 elements (B, Al, Ga, In)}	G11B7/243	G11B7/243		639
G11B2007/24312	13	{group 14 elements (e.g. Si, Ge, Sn)}	G11B7/243	G11B7/243		1035
G11B2007/24314	13	{group 15 elements (e.g. Sb, Bi)}	G11B7/243	G11B7/243		1127
G11B2007/24316	13	{group 16 elements (i.e. chalcogenides, Se, Te)}	G11B7/243	G11B7/243		1266
G11B2007/24318	12	{Non-metallic elements}	G11B7/243	G11B7/243		1
G11B2007/2432	13	{Oxygen}	G11B7/243	G11B7/243		474
G11B2007/24322	13	{Nitrogen}	G11B7/243	G11B7/243		125
G11B2007/24324	13	{Sulfur}	G11B7/243	G11B7/243		144
G11B2007/24326	13	{Halides (F, CI, Br...)}	G11B7/243	G11B7/243		71
G11B2007/24328	13	{Carbon}	G11B7/243	G11B7/243		165
G11B7/2433	12	Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te	G11B7/2433	G11B7/2433		628
G11B7/2437	12	Non-metallic elements	G11B7/2437	G11B7/2437		82
G11B7/244	11	comprising organic materials only	G11B7/244	G11B7/244		1231
G11B2007/2445	12	{containing an azulene compound}	G11B7/244	G11B7/244		
G11B7/245	12	containing a polymeric component	G11B7/245	G11B7/245		1214
G11B7/246	12	containing dyes	G11B7/246	G11B7/246		1153
G11B2007/24606	13	{Azo- dyes}	G11B7/246	G11B7/246		13
G11B2007/24612	13	{two or more dyes in one layer}	G11B7/246	G11B7/246		348
G11B2007/24618	13	{two or more dyes in two or more different layers, e.g. one dye absorbing at 405 nm in layer one and a different dye absorbing at 650 nm in layer two}	G11B7/246	G11B7/246		24
G11B2007/24624	13	{fluorescent dyes}	G11B7/246	G11B7/246		113
G11B7/2463	13	azulene	G11B7/2463	G11B7/2463		162
G11B7/2467	13	azo-dyes	G11B7/2467	G11B7/2467		594
G11B7/247	13	methine or polymethine dyes	G11B7/247	G11B7/247		384
G11B2007/24705	14	{Cyanine}	G11B7/247	G11B7/247		8
G11B2007/2471	14	{Merocyanine}	G11B7/247	G11B7/247		1
G11B2007/24715	14	{Oxonol}	G11B7/247	G11B7/247		1
G11B7/2472	14	cyanine	G11B7/2472	G11B7/2472		962
G11B7/2475	14	merocyanine	G11B7/2475	G11B7/2475		174
G11B7/2478	14	oxonol	G11B7/2478	G11B7/2478		110
G11B7/248	13	porphines; azaporphines, e.g. phthalocyanines	G11B7/248	G11B7/248		981
G11B7/249	12	containing organometallic compounds (G11B7/246 takes precedence)	G11B7/249	G11B7/249		533
G11B2007/24905	13	{neutral}	G11B7/249	G11B7/249		5
G11B2007/2491	13	{as anion}	G11B7/249	G11B7/249		2
G11B2007/24915	13	{as cation}	G11B7/249	G11B7/249		
G11B7/2492	13	neutral compounds	G11B7/2492	G11B7/2492		309
G11B7/2495	13	as anions	G11B7/2495	G11B7/2495		249
G11B7/2498	13	as cations	G11B7/2498	G11B7/2498		57
G11B7/25	12	containing liquid crystals	G11B7/25	G11B7/25		202
G11B7/251	11	comprising inorganic materials dispersed in an organic matrix	G11B7/251	G11B7/251		236
G11B7/252	10	of layers other than recording layers	G11B7/252	G11B7/252		916
G11B7/253	11	of substrates	G11B7/253	G11B7/253		403
G11B2007/25301	12	{comprising glass}	G11B7/253	G11B7/253		19
G11B2007/25302	12	{comprising metals}	G11B7/253	G11B7/253		18
G11B2007/25303	12	{comprising resins}	G11B7/253	G11B7/253		19
G11B2007/25304	13	{Polycarbonate [PC]}	G11B7/253	G11B7/253		14
G11B2007/25305	13	{Polyester, e.g. PET, PETG, PEN}	G11B7/253	G11B7/253		6
G11B2007/25306	13	{Polystyrene [PS]}	G11B7/253	G11B7/253		4
G11B2007/25307	13	{Polycycloolefines [COCs]}	G11B7/253	G11B7/253		2
G11B2007/25308	13	{Biodegradable polymers, cellulose included}	G11B7/253	G11B7/253		2
G11B7/2531	12	comprising glass	G11B7/2531	G11B7/2531		1074
G11B7/2532	12	comprising metals	G11B7/2532	G11B7/2532		224
G11B7/2533	12	comprising resins	G11B7/2533	G11B7/2533		1377
G11B7/2534	13	polycarbonates [PC]	G11B7/2534	G11B7/2534		1671
G11B7/2535	13	polyesters, e.g. PET, PETG or PEN	G11B7/2535	G11B7/2535		347
G11B7/2536	13	polystyrene [PS]	G11B7/2536	G11B7/2536		134
G11B7/2537	13	epoxy resins	G11B7/2537	G11B7/2537		2
G11B7/2538	13	polycycloolefins [PCO]	G11B7/2538	G11B7/2538		84
G11B7/2539	13	biodegradable polymers, e.g. cellulose	G11B7/2539	G11B7/2539		69
G11B7/254	11	of protective topcoat layers	G11B7/254	G11B7/254		458
G11B2007/25402	12	{consisting essentially of organic resins}	G11B7/254	G11B7/254		12
G11B2007/25405	13	{comprising inorganic filler, e.g. particles, fibres}	G11B7/254	G11B7/254		4
G11B2007/25408	12	{consisting essentially of inorganic materials}	G11B7/254	G11B7/254		12
G11B2007/25411	13	{containing transition metal elements (Zn, Fe, Co, Ni, Pt)}	G11B7/254	G11B7/254		42
G11B2007/25414	13	{containing Group 13 elements (B, Al, Ga)}	G11B7/254	G11B7/254		33
G11B2007/25417	13	{containing Group 14 elements (C, Si, Ge, Sn)}	G11B7/254	G11B7/254		75
G11B7/2542	12	consisting essentially of organic resins	G11B7/2542	G11B7/2542		958
G11B7/2545	13	containing inorganic fillers, e.g. particles or fibres	G11B7/2545	G11B7/2545		77
G11B7/2548	12	consisting essentially of inorganic materials	G11B7/2548	G11B7/2548		132
G11B7/256	11	of layers improving adhesion between layers	G11B7/256	G11B7/256		685
G11B7/257	11	of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers	G11B7/257	G11B7/257		932
G11B2007/25701	12	{consisting essentially of organic materials}	G11B7/257	G11B7/257		2
G11B2007/25703	13	{Resins}	G11B7/257	G11B7/257		6
G11B2007/25705	12	{consisting essentially of inorganic materials}	G11B7/257	G11B7/257		21
G11B2007/25706	13	{containing transition metal elements (Zn, Fe, Co, Ni, Pt)}	G11B7/257	G11B7/257		655
G11B2007/25708	13	{containing group 13 elements (B, Al, Ga)}	G11B7/257	G11B7/257		407
G11B2007/2571	13	{containing group 14 elements except carbon (Si, Ge, Sn, Pb)}	G11B7/257	G11B7/257		790
G11B2007/25711	13	{containing carbon}	G11B7/257	G11B7/257		146
G11B2007/25713	13	{containing nitrogen}	G11B7/257	G11B7/257		429
G11B2007/25715	13	{containing oxygen}	G11B7/257	G11B7/257		767
G11B2007/25716	13	{containing sulfur}	G11B7/257	G11B7/257		316
G11B2007/25718	13	{containing halides (F, Cl, Br, l)}	G11B7/257	G11B7/257		135
G11B7/2572	12	consisting essentially of organic materials	G11B7/2572	G11B7/2572		112
G11B7/2575	13	resins	G11B7/2575	G11B7/2575		253
G11B7/2578	12	consisting essentially of inorganic materials	G11B7/2578	G11B7/2578		602
G11B7/258	11	of reflective layers	G11B7/258	G11B7/258		812
G11B2007/2581	12	{based on aluminium}	G11B7/258	G11B7/258		28
G11B2007/2582	12	{based on silver}	G11B7/258	G11B7/258		16
G11B2007/2583	12	{based on gold}	G11B7/258	G11B7/258		9
G11B7/2585	12	based on aluminium	G11B7/2585	G11B7/2585		936
G11B7/259	12	based on silver	G11B7/259	G11B7/259		867
G11B7/2595	12	based on gold	G11B7/2595	G11B7/2595		485
G11B7/26	9	Apparatus or processes specially adapted for the manufacture of record carriers	G11B7/26	G11B7/26		3139
G11B7/261	10	{Preparing a master, e.g. exposing photoresist, electroforming}	G11B7/26	G11B7/26		937
G11B7/263	10	{Preparing and using a stamper, e.g. pressing or injection molding substrates (production of optical record carriers, e.g. optical discs B29D17/005)}	G11B7/26	G11B7/26		777
G11B7/265	10	{Apparatus for the mass production of optical record carriers, e.g. complete production stations, transport systems}	G11B7/26	G11B7/26		130
G11B7/266	10	{Sputtering or spin-coating layers (sputtering in general C23C14/24; spin-coating in general B05D1/005)}	G11B7/26	G11B7/26		679
G11B7/268	10	{Post-production operations, e.g. initialising phase-change recording layers, checking for defects (investigating the presence of flaws or contamination in optical discs G01N21/9506)}	G11B7/26	G11B7/26		261
G11B7/28	8	Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar record carriers	G11B7/28	G11B7/28		505
G11B9/00	7	Recording or reproducing using a method not covered by one of the main groups G11B3/00&#160;-&#160;G11B7/00; Record carriers therefor (G11B11/00 takes precedence {driving or moving of heads G11B21/02})	G11B9/00	G11B9/00		278
G11B9/02	8	using ferroelectric record carriers; Record carriers therefor	G11B9/02	G11B9/02		283
G11B9/04	8	using record carriers having variable electric resistance; Record carriers therefor	G11B9/04	G11B9/04		150
G11B9/06	8	using record carriers having variable electrical capacitance; Record carriers therefor (G11B9/02 takes precedence)	G11B9/06	G11B9/06		132
G11B9/061	9	{Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B05D, F16N, C08L)}	G11B9/06	G11B9/06		28
G11B9/062	10	{characterised by the form, e.g. comprising mechanical protection elements}	G11B9/06	G11B9/06		14
G11B9/063	10	{characterised by the selection of the material}	G11B9/06	G11B9/06		24
G11B9/065	11	{Additional layers for lubrication, wear protection or elimination of electrostatic charges of the interface between record carrier and head (G11B9/066, G11B9/067 and G11B9/068 take precedence)}	G11B9/06	G11B9/06		22
G11B9/066	11	{Electrically conductive layers (G11B9/068 takes precedence)}	G11B9/06	G11B9/06		10
G11B9/067	11	{Dielectric layers; Processes for providing electrical conductivity to them (G11B9/068 takes precedence)}	G11B9/06	G11B9/06		37
G11B9/068	11	{Moulding resin compositions}	G11B9/06	G11B9/06		83
G11B9/07	9	Heads for reproducing capacitive information	G11B9/07	G11B9/07		34
G11B9/075	10	{using mechanical contact with record carrier, e.g. by stylus}	G11B9/07	G11B9/07		249
G11B9/08	8	using electrostatic charge injection; Record carriers therefor	G11B9/08	G11B9/08		244
G11B9/10	8	using electron beam; Record carriers therefor (G11B9/08 takes precedence {see provisional also G11B11/03})	G11B9/10	G11B9/10		215
G11B9/12	8	using near-field interactions; Record carriers therefor	G11B9/12	G11B9/12		24
G11B9/14	9	using microscopic probe means {, i.e. recording or reproducing by means directly associated with the tip of a microscopic electrical probe as used in Scanning Tunneling Microscopy [STM] or Atomic Force Microscopy [AFM] for inducing physical or electrical perturbations in a recording medium; Record carriers or media specially adapted for such transducing of information (marking using electrical current B41M5/20; measuring roughness or irregularity of surfaces G01B7/34; details of scanning-probe microscopes G01Q)}	G11B9/14	G11B9/14		524
G11B9/1409	10	{Heads}	G11B9/14	G11B9/14		355
G11B9/1418	10	{Disposition or mounting of heads or record carriers (G11B17/00 and G11B19/00 take precedence)}	G11B9/14	G11B9/14		213
G11B9/1427	11	{with provision for moving the heads or record carriers relatively to each other or for access to indexed parts without effectively imparting a relative movement}	G11B9/14	G11B9/14		27
G11B9/1436	12	{with provision for moving the heads or record carriers relatively to each other}	G11B9/14	G11B9/14		175
G11B9/1445	13	{switching at least one head in operating function; Controlling the relative spacing to keep the head operative, e.g. for allowing a tunnel current flow}	G11B9/14	G11B9/14		82
G11B9/1454	13	{Positioning the head or record carrier into or out of operative position or across information tracks; Alignment of the head relative to the surface of the record carrier (G11B9/1445 takes precedence)}	G11B9/14	G11B9/14		113
G11B9/1463	10	{Record carriers for recording or reproduction involving the use of microscopic probe means}	G11B9/14	G11B9/14		108
G11B9/1472	11	{characterised by the form}	G11B9/14	G11B9/14		138
G11B9/1481	12	{Auxiliary features, e.g. reference or indexing surfaces}	G11B9/14	G11B9/14		59
G11B9/149	11	{characterised by the memorising material or structure}	G11B9/14	G11B9/14		253
G11B11/00	7	Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00&#160;-&#160;G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor {(driving or moving of heads G11B3/02, G11B5/48, G11B7/08, G11B21/02)}<br><br><u>NOTE</u><br><br> Groups G11B11/00&#160;-&#160;G11B11/14  mainly cover: <br>combined systems or apparatus comprising both recording and reproducing using different methods; <br>record carriers therefor. <br> Reading only or recording only using mechanical, magnetic, optical or other methods is covered by groups G11B3/00&#160;-&#160;G11B9/08	G11B11/00	G11B11/00		524
G11B11/002	8	{using recording by perturbation of the physical or electrical structure}	G11B11/00	G11B11/00		69
G11B11/005	9	{with reproducing by using non-optical beam of radiation or particles, e.g. electrons, directly interacting with the memorised information (G11B11/007 takes precedence)}	G11B11/00	G11B11/00		12
G11B11/007	9	{with reproducing by means directly associated with the tip of a microscopic electrical probe as defined in G11B9/14(details of heads G11B9/1409; disposition or mounting of heads G11B9/1418)}	G11B11/00	G11B11/00		109
G11B11/03	8	using recording by deforming with non-mechanical means, e.g. laser, beam of particles {(G11B11/002 takes precedence; see proviosional also G11B3/68&#160;-&#160;G11B3/72)}	G11B11/03	G11B11/03		147
G11B11/05	9	with reproducing by capacitive means {(G11B9/07 takes precedence)}	G11B11/05	G11B11/05		26
G11B11/06	9	with reproducing by mechanical sensing	G11B11/06	G11B11/06		27
G11B11/08	8	using recording by electric charge or by variation of electric resistance or capacitance {(G11B11/002, G11B11/10 take precedence)}	G11B11/08	G11B11/08		238
G11B11/10	8	using recording by magnetic means {or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field}	G11B11/10	G11B11/10		399
G11B11/105	9	using a beam of light or a magnetic field for recording {by change of magnetisation} and a beam of light for reproducing, {i.e. magneto-optical,} e.g. light-induced thermomagnetic recording, {spin magnetisation recording,} Kerr {or Faraday} effect reproducing	G11B11/105	G11B11/105		1200
G11B11/10502	10	{characterised by the transducing operation to be executed}	G11B11/105	G11B11/105		118
G11B11/10504	11	{Recording (for shaping of magnetic domains G11B11/10528, for compensation of shift G11B11/1053)}	G11B11/105	G11B11/105		212
G11B11/10506	12	{by modulating only the light beam of the transducer}	G11B11/105	G11B11/105		259
G11B11/10508	12	{by modulating only the magnetic field at the transducer}	G11B11/105	G11B11/105		211
G11B11/1051	12	{by modulating both the magnetic field and the light beam at the transducers}	G11B11/105	G11B11/105		53
G11B11/10513	13	{one of the light beam or the magnetic field being modulated by data and the other by a clock or frequency generator}	G11B11/105	G11B11/105		39
G11B11/10515	11	{Reproducing (compensating pit shift G11B11/1053)}	G11B11/105	G11B11/105		819
G11B11/10517	11	{Overwriting or erasing (G11B11/10526 takes precedence)}	G11B11/105	G11B11/105		155
G11B11/10519	12	{Direct overwriting, i.e. performing erasing and recording using the same transducing means}	G11B11/105	G11B11/105		70
G11B11/10521	13	{using a single light spot}	G11B11/105	G11B11/105		147
G11B11/10523	11	{Initialising}	G11B11/105	G11B11/105		48
G11B11/10526	11	{Bulk initialisation or erasing, e.g. at least one whole information track with a single action}	G11B11/105	G11B11/105		46
G11B11/10528	11	{Shaping of magnetic domains, e.g. form, dimensions}	G11B11/105	G11B11/105		123
G11B11/1053	11	{to compensate for the magnetic domain drift or time shift}	G11B11/105	G11B11/105		162
G11B11/10532	10	{Heads}	G11B11/105	G11B11/105		536
G11B11/10534	11	{for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording}	G11B11/105	G11B11/105		271
G11B11/10536	12	{using thermic beams, e.g. lasers}	G11B11/105	G11B11/105		289
G11B11/10539	12	{using electromagnetic beams, e.g. polarised light}	G11B11/105	G11B11/105		31
G11B11/10541	11	{for reproducing}	G11B11/105	G11B11/105		94
G11B11/10543	12	{using optical beam of radiation}	G11B11/105	G11B11/105		544
G11B11/10545	13	{interacting directly with the magnetisation on the record carrier}	G11B11/105	G11B11/105		171
G11B11/10547	13	{interacting with the magnetisation of an intermediate transfer element, e.g. magnetic film, included in the head}	G11B11/105	G11B11/105		158
G11B11/1055	10	{Disposition or mounting of transducers relative to record carriers}	G11B11/105	G11B11/105		107
G11B11/10552	11	{Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base (for relative movement of transducers G11B11/10573)}	G11B11/105	G11B11/105		86
G11B11/10554	12	{the transducers being disposed on the same side of the carrier (flying heads G11B11/1058)}	G11B11/105	G11B11/105		333
G11B11/10556	11	{with provision for moving or switching or masking the transducers in or out of their operative position}	G11B11/105	G11B11/105		66
G11B11/10558	12	{in view of the loading or unloading of the carrier}	G11B11/105	G11B11/105		152
G11B11/1056	12	{Switching or mechanically reversing the magnetic field generator}	G11B11/105	G11B11/105		76
G11B11/10563	12	{Access of indexed parts}	G11B11/105	G11B11/105		142
G11B11/10565	13	{Marks for track change, e.g. prepits, gray codes}	G11B11/105	G11B11/105		85
G11B11/10567	12	{Mechanically moving the transducers}	G11B11/105	G11B11/105		16
G11B11/10569	13	{Swing arm positioners}	G11B11/105	G11B11/105		53
G11B11/10571	13	{Sled type positioners}	G11B11/105	G11B11/105		77
G11B11/10573	12	{Control of relative positioning of the magnetic and optical transducers, e.g. to move simultaneously}	G11B11/105	G11B11/105		43
G11B11/10576	11	{with provision for moving the transducers for maintaining alignment or spacing relative to the carrier}	G11B11/105	G11B11/105		481
G11B11/10578	12	{Servo format, e.g. prepits, guide tracks, pilot signals}	G11B11/105	G11B11/105		219
G11B11/1058	11	{Flying heads}	G11B11/105	G11B11/105		459
G11B11/10582	10	{Record carriers characterised by the selection of the material or by the structure or form}	G11B11/105	G11B11/105		571
G11B11/10584	11	{characterised by the form, e.g. comprising mechanical protection elements}	G11B11/105	G11B11/105		885
G11B11/10586	11	{characterised by the selection of the material}	G11B11/105	G11B11/105		1057
G11B11/10589	12	{Details}	G11B11/105	G11B11/105		162
G11B11/10591	13	{for improving write-in properties, e.g. Curie-point temperature}	G11B11/105	G11B11/105		217
G11B11/10593	13	{for improving read-out properties, e.g. polarisation of light}	G11B11/105	G11B11/105		201
G11B11/10595	10	{Control of operating function}	G11B11/105	G11B11/105		819
G11B11/10597	11	{Adaptations for transducing various formats on the same or different carriers}	G11B11/105	G11B11/105		296
G11B11/11	9	using a beam, {e.g. of electrons or X-rays} other than a beam of light {or a magnetic field} for recording	G11B11/11	G11B11/11		39
G11B11/115	9	{using a beam,}{e.g. of electrons or X-rays} other than a beam of light for reproducing	G11B11/115	G11B11/115		31
G11B11/12	8	using recording by optical means (G11B11/03 takes precedence {G11B11/10 takes precedence})	G11B11/12	G11B11/12		54
G11B11/14	9	with reproducing by magnetic means	G11B11/14	G11B11/14		16
G11B11/16	8	using recording by mechanical cutting, deforming or pressing {(G11B11/002 takes precedence)}	G11B11/16	G11B11/16		33
G11B11/18	9	with reproducing by optical means	G11B11/18	G11B11/18		55
G11B11/20	9	with reproducing by magnetic means	G11B11/20	G11B11/20		20
G11B11/22	9	with reproducing by capacitive means<br><br><u>NOTE</u><br><br>see provisionally G11B9/06, G11B9/07; G11B11/05.	G11B11/22	G11B11/22		4
G11B11/24	8	using recording by near-field interactions	G11B11/24	G11B11/24		40
G11B11/26	9	using microscopic probe means {, i.e. recording by means directly associated with the tip of a microscopic electrical probe as used in scanning tunneling microscopy [STM] or atomic force microscopy [AFM] for inducing physical or electrical perturbations in a recording medium (marking using electrical current B41M5/20; measuring roughness or irregularity of surfaces G01B7/34; details of scanning-probe microscopes G01Q)}	G11B11/26	G11B11/26		20
G11B13/00	7	Recording simultaneously or selectively by methods covered by different main groups {among G11B3/00, G11B5/00, G11B7/00 and G11B9/00}; Record carriers therefor {not otherwise provided for}; Reproducing therefrom {not otherwise provided for (G11B9/14, G11B11/002 take precedence; driving or moving of heads G11B3/02, G11B5/48, G11B7/08, G11B21/02)}<br><br><u>NOTE</u><br><br> This group is limited to the combination of recording and reproducing on the same record carrier by more than one of the different method covered by groups G11B3/00, G11B5/00, G11B7/00 and G11B9/00	G11B13/00	G11B13/00		158
G11B13/02	8	magnetically and by styli	G11B13/02	G11B13/02		15
G11B13/04	8	magnetically {or by magnetisation} and optically {or by radiation, for changing or sensing optical properties}	G11B13/04	G11B13/04		290
G11B13/045	9	{combined recording by magnetic and optic means}	G11B13/04	G11B13/04		191
G11B13/06	8	optically and by styli	G11B13/06	G11B13/06		26
G11B13/08	8	using near-field interactions or transducing means and at least one other method or means for recording or reproducing	G11B13/08	G11B13/08		144
G11B15/00	7	Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function (driving or guiding heads G11B3/00&#160;-&#160;G11B7/00, G11B21/00)	G11B15/00	G11B15/00		354
G11B15/005	8	{Programmed access in sequence to indexed parts of tracks of operating tapes, by driving or guiding the tape (access by driving of both record carrier and head G11B15/1816; see prov. also G11B15/602)}	G11B15/00	G11B15/00		419
G11B15/02	8	Control of operating function, e.g. switching from recording to reproducing	G11B15/02	G11B15/02		2175
G11B15/023	9	{remotely controlled}	G11B15/02	G11B15/02		566
G11B15/026	9	{by using processor, e.g. microcomputer}<br><br><u>NOTE</u><br><br>see provisional also G11B15/005.	G11B15/02	G11B15/02		2075
G11B15/03	9	by using counters<br><br><u>NOTE</u><br><br>see prov. also G11B15/00, G11B27/00.	G11B15/03	G11B15/03		396
G11B15/04	9	Preventing, inhibiting, or warning against accidental erasing or double recording (G11B15/05 takes precedence)	G11B15/04	G11B15/04		346
G11B15/05	9	by sensing features present on or derived from record carrier or container (G11B15/16 takes precedence)<br><br><u>NOTE</u><br><br>see provisional also G11B15/02.	G11B15/05	G11B15/05		205
G11B15/06	10	by sensing auxiliary features on record carriers or containers, e.g. to stop machine near the end of a tape	G11B15/06	G11B15/06		665
G11B15/07	11	on containers<br><br><u>NOTE</u><br><br>see provisional also G11B15/06.	G11B15/07	G11B15/07		342
G11B15/08	11	by photoelectric sensing (G11B15/07 takes precedence)	G11B15/08	G11B15/08		434
G11B15/087	10	by sensing recorded signals<br><br><u>NOTE</u><br><br>see provisional also G11B15/06, G11B15/02, G11B27/00.	G11B15/087	G11B15/087		1176
G11B15/093	10	by sensing driving condition of record carrier, e.g. travel, tape tension<br><br><u>NOTE</u><br><br>see provisional also G11B15/16, G11B15/22, G11B15/46.	G11B15/093	G11B15/093		620
G11B15/10	9	Manually-operated control; Solenoid-operated control {(G11B15/44 takes precedence)}	G11B15/10	G11B15/10		1076
G11B15/103	10	{electrically operated}	G11B15/10	G11B15/10		273
G11B15/106	10	{mechanically operated}	G11B15/10	G11B15/10		276
G11B15/12	9	Masking of heads; {circuits for} Selecting or switching of heads between operative and inoperative functions {or between different operative functions or for selection between operative heads}; Masking of beams, e.g. of light beams {(track selection by moving the magnetic head G11B5/54)}	G11B15/12	G11B15/12		346
G11B15/125	10	{conditioned by the operating function of the apparatus}	G11B15/12	G11B15/12		497
G11B15/14	10	Masking or switching periodically, e.g. of rotating heads	G11B15/14	G11B15/14		473
G11B15/16	9	by sensing presence, absence or position of record carrier or container	G11B15/16	G11B15/16		436
G11B15/17	10	of container<br><br><u>NOTE</u><br><br>see prov. also G11B15/16.	G11B15/17	G11B15/17		139
G11B15/18	8	Driving; Starting; Stopping; Arrangements for control or regulation thereof {(G11B15/56 takes precedence)}	G11B15/18	G11B15/18		1086
G11B15/1808	9	{Driving of both record carrier and head (G11B15/467 takes precedence; mounting of head G11B5/52)}	G11B15/18	G11B15/18		450
G11B15/1816	10	{Programmed access in sequence to indexed parts of operating tapes cooperating with rotating heads (see provisional also G11B15/005)}	G11B15/18	G11B15/18		68
G11B15/1825	10	{driving or moving the head in a direction which cuts across the direction of travel of the tape, e.g. for helico&#239;dal scanning}	G11B15/18	G11B15/18		30
G11B15/1833	11	{with head driven in a plane, cyclically around an axis, e.g. on headwheel (construction of headwheel G11B5/53, G11B21/16; disposition of heads on headwheel G11B5/531, G11B21/02)}	G11B15/18	G11B15/18		34
G11B15/1841	12	{with provision for information tracking by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement, e.g. for skew or time base correction (in the direction which cuts across tracks, i.e. for track following G11B3/38, G11B5/588, G11B7/085, G11B21/08, G11B21/10; by controlling headwheel rotation G11B15/4733, by guiding the tape G11B15/602)}	G11B15/18	G11B15/18		22
G11B15/185	13	{using signals recorded in tracks disposed in parallel with the scanning direction}	G11B15/18	G11B15/18		7
G11B15/1858	14	{using auxiliary signals, i.e. pilot signals}	G11B15/18	G11B15/18		6
G11B15/1866	15	{superimposed on the main signal track}	G11B15/18	G11B15/18		
G11B15/1875	10	{adaptations for special effects or editing (signal processing or indexing therefor G11B27/00)}	G11B15/18	G11B15/18		1078
G11B15/1883	9	{for record carriers inside containers}	G11B15/18	G11B15/18		833
G11B15/1891	10	{the record carrier being endless}	G11B15/18	G11B15/18		129
G11B15/20	9	Moving record carrier backwards or forwards by finite amounts, i.e. backspacing, forward spacing	G11B15/20	G11B15/20		407
G11B15/22	9	Stopping means ({G11B15/06 takes precedence;} slowing-down preparatory to stopping or speed-changing G11B15/48; speed-controlling by mechanical linkage G11B15/50{; inside container G11B23/04})	G11B15/22	G11B15/22		1115
G11B15/24	9	Drive disengaging means	G11B15/24	G11B15/24		124
G11B15/26	9	Driving record carriers by members acting directly or indirectly thereon {(G11B15/44 takes precedence; driving features inside container, seeG11B23/04 and subgroups)}	G11B15/26	G11B15/26		714
G11B15/28	10	through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal	G11B15/28	G11B15/28		1130
G11B15/285	11	{through pneumatic means}	G11B15/28	G11B15/28		37
G11B15/29	11	through pinch-rollers {or tape rolls}(G11B15/295 takes precedence)	G11B15/29	G11B15/29		1260
G11B15/295	11	with single capstan or drum simultaneously driving the record carrier at two separate points of an isolated part thereof, e.g. the capstan acting directly on the tape rollers	G11B15/295	G11B15/295		208
G11B15/30	10	through the means for supporting the record carrier, e.g. mandrel, turntable	G11B15/30	G11B15/30		91
G11B15/32	10	through the reels or cores on to which the record carrier is wound	G11B15/32	G11B15/32		1376
G11B15/34	10	through non-slip drive means, e.g. sprocket	G11B15/34	G11B15/34		387
G11B15/38	9	Driving record carriers by pneumatic means {(pneumatic control for capstans driving the record carrier by frictional contact G11B15/285)}	G11B15/38	G11B15/38		136
G11B15/385	10	{directly, e.g. by rotating drum (guiding record carrier on rotating drum G11B15/61)}	G11B15/38	G11B15/38		26
G11B15/40	9	Driving record carriers otherwise than by electric motor	G11B15/40	G11B15/40		96
G11B15/42	10	manually	G11B15/42	G11B15/42		30
G11B15/43	9	Control or regulation of mechanical tension of record carrier, e.g. tape tension	G11B15/43	G11B15/43		1758
G11B15/44	9	Speed-changing arrangements; Reversing arrangements; Drive transfer means therefor	G11B15/44	G11B15/44		958
G11B15/442	10	{Control thereof}	G11B15/44	G11B15/44		1033
G11B15/444	10	{reversing arrangements (G11B15/442 takes precedence)}	G11B15/44	G11B15/44		324
G11B15/446	11	{by driving the reels only}	G11B15/44	G11B15/44		24
G11B15/448	12	{automatic reverse drive transfer therefor}	G11B15/44	G11B15/44		36
G11B15/46	9	Controlling, regulating, or indicating speed {(dependent on position of tape in reserve, loop G11B15/56, G11B15/58)}	G11B15/46	G11B15/46		1049
G11B15/463	10	{by using pilot tracking tones embedded in binary coded signals, e.g. using DSV/CDS values of coded signals}	G11B15/46	G11B15/46		58
G11B15/467	10	in arrangements for recording or reproducing wherein both record carriers and heads are driven {(see provisional also G11B15/1808)}	G11B15/467	G11B15/467		244
G11B15/4671	11	{by controlling simultaneously the speed of the tape and the speed of the rotating head}	G11B15/467	G11B15/467		136
G11B15/4672	12	{with provision for information tracking}	G11B15/467	G11B15/467		81
G11B15/4673	11	{by controlling the speed of the tape while the head is rotating}	G11B15/467	G11B15/467		250
G11B15/4675	12	{with provision for information tracking}	G11B15/467	G11B15/467		126
G11B15/4676	13	{using signals recorded in tracks disposed in parallel with the scanning direction}	G11B15/467	G11B15/467		78
G11B15/4677	14	{using auxiliary signals, i.e. pilot signals}	G11B15/467	G11B15/467		53
G11B15/4678	15	{superimposed on the main signal track}	G11B15/467	G11B15/467		215
G11B15/473	11	by controlling the speed of the heads<br><br><u>NOTE</u><br><br>see prov. also G11B5/588.	G11B15/473	G11B15/473		138
G11B15/4731	12	{control of headwheel rotation (disposition or construction of headwheel motor G11B5/53, G11B21/02)}	G11B15/473	G11B15/473		131
G11B15/4733	13	{with provision for information tracking, e.g. for time base correction}	G11B15/473	G11B15/473		41
G11B15/4735	14	{using signals recorded in tracks disposed parallel with the scanning direction}	G11B15/473	G11B15/473		15
G11B15/4736	15	{using auxiliary signals, i.e. pilot signals}	G11B15/473	G11B15/473		4
G11B15/4738	16	{superimposed on the main signal track}	G11B15/473	G11B15/473		9
G11B15/48	10	Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change	G11B15/48	G11B15/48		480
G11B15/50	10	by mechanical linkage, e.g. clutch	G11B15/50	G11B15/50		642
G11B15/52	10	by using signals recorded on, or derived from, record carrier	G11B15/52	G11B15/52		311
G11B15/54	10	by stroboscope; by tachometer	G11B15/54	G11B15/54		380
G11B15/56	8	the record carrier having reserve loop, e.g. to minimise inertia during acceleration {measuring or control in connection therewith}	G11B15/56	G11B15/56		253
G11B15/58	9	with vacuum column	G11B15/58	G11B15/58		422
G11B15/60	8	Guiding record carrier (guiding devices structurally associated with magazines or cassettes G11B23/04)	G11B15/60	G11B15/60		1129
G11B15/602	9	{for track selection, acquisition or following}	G11B15/60	G11B15/60		379
G11B15/605	9	{without displacing the guiding means}	G11B15/60	G11B15/60		264
G11B15/607	10	{Pneumatic guiding}	G11B15/60	G11B15/60		43
G11B15/61	9	on drum, e.g. drum containing rotating heads {(G11B15/66 takes precedence)}	G11B15/61	G11B15/61		2030
G11B15/615	10	{inside container}	G11B15/61	G11B15/61		123
G11B15/62	9	Maintaining desired spacing between record carrier and head	G11B15/62	G11B15/62		634
G11B15/64	10	by fluid-dynamic spacing	G11B15/64	G11B15/64		153
G11B15/66	9	Threading; Loading; Automatic self-loading	G11B15/66	G11B15/66		906
G11B15/662	10	{Positioning or locking of spool or reel}	G11B15/66	G11B15/66		315
G11B15/665	10	by extracting loop of record carrier from container	G11B15/665	G11B15/665		373
G11B15/6651	11	{to pull the record carrier against non rotating heads}	G11B15/665	G11B15/665		58
G11B15/6653	11	{to pull the record carrier against drum}	G11B15/665	G11B15/665		1381
G11B15/6655	12	{using one loading ring, i.e. "C-type" (G11B15/6658 takes precedence)}	G11B15/665	G11B15/665		145
G11B15/6656	12	{using two-sided extraction, i.e. "M-type"}	G11B15/665	G11B15/665		697
G11B15/6658	13	{with two loading rings rotating in opposite directions}	G11B15/665	G11B15/665		49
G11B15/67	10	by extracting end of record carrier from container or spool	G11B15/67	G11B15/67		501
G11B15/671	11	{using pneumatic means}	G11B15/67	G11B15/67		74
G11B15/672	11	{Extracting end of record carrier from container or single reel (G11B15/671 takes precedence)}	G11B15/67	G11B15/67		86
G11B15/673	11	{Threading end of record carrier externally to single reel (G11B15/671 takes precedence)}	G11B15/67	G11B15/67		30
G11B15/674	11	{Threading or attaching end of record carrier on or to single reel (G11B15/671 takes precedence)}	G11B15/67	G11B15/67		338
G11B15/675	8	Guiding containers {, e.g. loading, ejecting cassettes}	G11B15/675	G11B15/675		1537
G11B15/67502	9	{Details}	G11B15/675	G11B15/675		392
G11B15/67505	10	{Servo control}	G11B15/675	G11B15/675		113
G11B15/67507	10	{Ejection damping means}	G11B15/675	G11B15/675		53
G11B15/6751	9	{with movement of the cassette parallel to its main side, i.e. front loading (G11B15/67544 takes precedence)}	G11B15/675	G11B15/675		207
G11B15/67513	10	{and movement of driving elements perpendicular thereto}	G11B15/675	G11B15/675		56
G11B15/67515	11	{with servo control}	G11B15/675	G11B15/675		9
G11B15/67518	11	{with ejection damping means}	G11B15/675	G11B15/675		4
G11B15/67521	10	{of cassette with internal belt drive}	G11B15/675	G11B15/675		69
G11B15/67523	11	{with servo control}	G11B15/675	G11B15/675		12
G11B15/67526	11	{with ejection damping means}	G11B15/675	G11B15/675		1
G11B15/67528	10	{of endless tape cassette}	G11B15/675	G11B15/675		15
G11B15/67531	11	{with servo control}	G11B15/675	G11B15/675		7
G11B15/67534	11	{with ejection damping means}	G11B15/675	G11B15/675		
G11B15/67536	10	{of cassette inside drawer}	G11B15/675	G11B15/675		44
G11B15/67539	11	{with servo control}	G11B15/675	G11B15/675		14
G11B15/67542	11	{with ejection damping means}	G11B15/675	G11B15/675		3
G11B15/67544	9	{with movement of the cassette parallel to its main side and subsequent movement perpendicular thereto, i.e. front loading}	G11B15/675	G11B15/675		145
G11B15/67547	10	{the two movements being made by the cassette holder}	G11B15/675	G11B15/675		165
G11B15/67549	11	{with servo control}	G11B15/675	G11B15/675		174
G11B15/67552	11	{with ejection damping means}	G11B15/675	G11B15/675		9
G11B15/67555	10	{the second movement only being made by the cassette holder}	G11B15/675	G11B15/675		145
G11B15/67557	11	{with servo control}	G11B15/675	G11B15/675		38
G11B15/6756	11	{with ejection damping means}	G11B15/675	G11B15/675		2
G11B15/67563	9	{with movement of the cassette perpendicular to its main side, i.e. top loading}	G11B15/675	G11B15/675		30
G11B15/67565	10	{of the cassette with holder}	G11B15/675	G11B15/675		107
G11B15/67568	11	{with servo control}	G11B15/675	G11B15/675		3
G11B15/67571	11	{with ejection damping means}	G11B15/675	G11B15/675		11
G11B15/67573	10	{of the cassette without holder}	G11B15/675	G11B15/675		56
G11B15/67576	11	{with servo control}	G11B15/675	G11B15/675		5
G11B15/67578	11	{with ejection damping means}	G11B15/675	G11B15/675		2
G11B15/67581	9	{with pivoting movement of the cassette holder}	G11B15/675	G11B15/675		103
G11B15/67584	10	{outside the apparatus}	G11B15/675	G11B15/675		149
G11B15/67586	11	{with servo control}	G11B15/675	G11B15/675		8
G11B15/67589	11	{with ejection damping means}	G11B15/675	G11B15/675		13
G11B15/67592	10	{inside the apparatus}	G11B15/675	G11B15/675		51
G11B15/67594	11	{with servo control}	G11B15/675	G11B15/675		1
G11B15/67597	11	{with ejection damping means}	G11B15/675	G11B15/675		2
G11B15/68	9	Automatic cassette changing arrangements; {automatic tape changing arrangements}	G11B15/68	G11B15/68		380
G11B15/6805	10	{with linearly moving rectangular box shaped magazines}	G11B15/68	G11B15/68		15
G11B15/681	11	{in vertical direction}	G11B15/68	G11B15/68		41
G11B15/6815	11	{in horizontal direction}	G11B15/68	G11B15/68		71
G11B15/682	10	{with fixed magazines having fixed cassette storage cells, e.g. in racks}	G11B15/68	G11B15/68		65
G11B15/6825	11	{Details of magazines, e.g. removable, adapted for cassettes of different sizes}	G11B15/68	G11B15/68		125
G11B15/683	11	{wherein the recorder or player is moved according to the location of a selected cassette (G11B15/684 takes precedence)}	G11B15/68	G11B15/68		48
G11B15/6835	11	{the cassettes being transferred to a fixed recorder or player using a moving carriage}	G11B15/68	G11B15/68		746
G11B15/684	11	{the cassettes having a storage position inside the magazine and a slightly shifted active position, e.g. by solenoid}	G11B15/68	G11B15/68		36
G11B15/6845	10	{with rotatable magazine}	G11B15/68	G11B15/68		10
G11B15/685	11	{the cassettes being arranged in a single level}	G11B15/68	G11B15/68		33
G11B15/6855	12	{wherein the recorder or player is moved towards a selected cassette in the magazine}	G11B15/68	G11B15/68		18
G11B15/686	12	{with a fixed recorder or player in the centre or at the periphery of the magazine}	G11B15/68	G11B15/68		43
G11B15/6865	12	{with a fixed recorder or player under the magazine}	G11B15/68	G11B15/68		28
G11B15/687	11	{the cassettes being arranged in multiple levels}	G11B15/68	G11B15/68		7
G11B15/6875	12	{wherein the recorder or player is moved towards a selected cassette in the magazine}	G11B15/68	G11B15/68		24
G11B15/688	12	{the cassettes being transferred to a fixed recorder or player using a moving carriage}	G11B15/68	G11B15/68		79
G11B15/6885	10	{the cassettes being conveyed within a cassette storage location, e.g. within a storage bin or conveying by belt}	G11B15/68	G11B15/68		226
G11B15/689	10	{Control of the cassette changing arrangement}	G11B15/68	G11B15/68		249
G11B15/6895	10	{Automatic tape changing arrangements}	G11B15/68	G11B15/68		180
G11B15/70	8	the record carrier being an endless loop record carrier {(inside container G11B15/1891)}	G11B15/70	G11B15/70		213
G11B17/00	7	Guiding record carriers not specifically of filamentary or web form, or of supports therefor (guiding cards or sheets G06K13/00)	G11B17/00	G11B17/00		853
G11B17/005	8	{Programmed access to indexed parts of tracks of operating discs, by guiding the disc}	G11B17/00	G11B17/00		198
G11B17/02	8	Details	G11B17/02	G11B17/02		1777
G11B17/021	9	{Selecting or spacing of record carriers for introducing the heads}	G11B17/02	G11B17/02		495
G11B17/022	9	Positioning or locking of single discs	G11B17/022	G11B17/022		367
G11B17/025	10	of discs which are stationary during transducing operation	G11B17/025	G11B17/025		35
G11B17/0255	11	{flexible discs}	G11B17/025	G11B17/025		15
G11B17/028	10	of discs rotating during transducing operation	G11B17/028	G11B17/028		609
G11B17/0281	11	{by an adapter enabling the centre-pin to receive carriers with large centre hole}	G11B17/028	G11B17/028		116
G11B17/0282	11	{by means provided on the turntable}	G11B17/028	G11B17/028		1213
G11B17/0283	12	{Two or more turntables}	G11B17/028	G11B17/028		59
G11B17/0284	11	{by clampers}	G11B17/028	G11B17/028		1070
G11B17/0285	12	{mounted on a bridge}	G11B17/028	G11B17/028		95
G11B17/0286	12	{mounted on a pivotal lever}	G11B17/028	G11B17/028		186
G11B17/0287	11	{by permanent connections, e.g. screws, rivets}	G11B17/028	G11B17/028		259
G11B17/0288	11	{by means for moving the turntable or the clamper towards the disk}	G11B17/028	G11B17/028		332
G11B17/03	11	in containers or trays {(G11B17/032, G11B17/035 take precedence)}	G11B17/03	G11B17/03		889
G11B17/032	11	Positioning by moving the door or the cover {(G11B17/035 takes precedence)}	G11B17/032	G11B17/032		303
G11B17/035	11	Positioning by moving the loading station	G11B17/035	G11B17/035		290
G11B17/038	9	Centering or locking of a plurality of discs in a single cartridge	G11B17/038	G11B17/038		672
G11B17/04	9	Feeding or guiding single record carrier to or from transducer unit {(guiding during transducing operation G11B17/34)}	G11B17/04	G11B17/04		1284
G11B17/0401	10	{Details}	G11B17/04	G11B17/04		240
G11B17/0402	11	{Servo control}	G11B17/04	G11B17/04		130
G11B17/0404	12	{with parallel drive rollers}	G11B17/04	G11B17/04		285
G11B17/0405	11	{Closing mechanism, e.g. door}	G11B17/04	G11B17/04		462
G11B17/0407	12	{controlling the loading of the record carrier}	G11B17/04	G11B17/04		113
G11B17/0408	10	{of non-disc record carrier, e.g. card}	G11B17/04	G11B17/04		81
G11B17/041	10	specially adapted for discs contained within cartridges	G11B17/041	G11B17/041		146
G11B17/043	11	Direct insertion, i.e. without external loading means	G11B17/043	G11B17/043		359
G11B17/0432	12	{adapted for discs of different sizes}	G11B17/043	G11B17/043		21
G11B17/0434	12	{with mechanism for subsequent vertical movement of the disc (G11B17/0438 takes precedence)}	G11B17/043	G11B17/043		231
G11B17/0436	12	{with opening mechanism of the cartridge shutter (G11B17/0438 takes precedence)}	G11B17/043	G11B17/043		201
G11B17/0438	12	{with mechanism for subsequent vertical movement of the disc and opening mechanism of the cartridge shutter}	G11B17/043	G11B17/043		117
G11B17/044	11	Indirect insertion, i.e. with external loading means	G11B17/044	G11B17/044		25
G11B17/046	12	with pivoting loading means	G11B17/046	G11B17/046		121
G11B17/0463	13	{adapted for discs of different sizes}	G11B17/046	G11B17/046		9
G11B17/0466	13	{with opening mechanism of the cartridge shutter}	G11B17/046	G11B17/046		33
G11B17/047	12	with sliding loading means	G11B17/047	G11B17/047		175
G11B17/0473	13	{adapted for discs of different sizes}	G11B17/047	G11B17/047		13
G11B17/0476	13	{with opening mechanism of the cartridge shutter}	G11B17/047	G11B17/047		22
G11B17/049	11	Insertion of discs having to be extracted from the cartridge prior to recording or reproducing	G11B17/049	G11B17/049		170
G11B17/05	10	specially adapted for discs not contained within cartridges	G11B17/05	G11B17/05		240
G11B17/051	11	Direct insertion, i.e. without external loading means	G11B17/051	G11B17/051		819
G11B17/0515	12	{adapted for discs of different sizes}	G11B17/051	G11B17/051		319
G11B17/053	11	Indirect insertion, i.e. with external loading means	G11B17/053	G11B17/053		117
G11B17/054	12	with pivoting loading means	G11B17/054	G11B17/054		115
G11B17/0545	13	{adapted for discs of different sizes}	G11B17/054	G11B17/054		22
G11B17/056	12	with sliding loading means	G11B17/056	G11B17/056		1592
G11B17/0565	13	{adapted for discs of different sizes}	G11B17/056	G11B17/056		101
G11B17/057	10	specially adapted for handling both discs contained within cartridges and discs not contained within cartridges	G11B17/057	G11B17/057		155
G11B17/08	8	from consecutive-access magazine of disc records	G11B17/08	G11B17/08		212
G11B17/10	9	with horizontal transfer to the turntable from a stack arranged with a vertical axis	G11B17/10	G11B17/10		185
G11B17/12	9	with axial transfer to the turntable from a stack with a vertical axis	G11B17/12	G11B17/12		97
G11B17/14	10	by mechanism in rotating centre post, e.g. permitting the playing of both sides of a record	G11B17/14	G11B17/14		254
G11B17/16	10	by mechanism in stationary centre post, e.g. with stepped post, using fingers on post	G11B17/16	G11B17/16		1064
G11B17/162	11	{with means for detecting the diameter of the record}	G11B17/16	G11B17/16		6
G11B17/165	12	{with mechanical detecting means}	G11B17/16	G11B17/16		134
G11B17/167	12	{with optical detecting means}	G11B17/16	G11B17/16		3
G11B17/18	10	by mechanism operating on the edge of the disc record	G11B17/18	G11B17/18		54
G11B17/20	9	with transfer away from stack on turntable after playing	G11B17/20	G11B17/20		24
G11B17/22	8	from random access magazine of disc records	G11B17/22	G11B17/22		1016
G11B17/221	9	{with movable magazine (G11B17/24&#160;-&#160;G11B17/28 take precedence)}	G11B17/22	G11B17/22		127
G11B17/223	10	{in a vertical direction}	G11B17/22	G11B17/22		261
G11B17/225	9	{wherein the disks are transferred from a fixed magazine to a fixed playing unit using a moving carriage}	G11B17/22	G11B17/22		1008
G11B17/226	9	{the magazine consisting of a single rotatable tray carrying the disks}	G11B17/22	G11B17/22		212
G11B17/228	9	{Control systems for magazines (G11B17/225 takes precedence)}	G11B17/22	G11B17/22		371
G11B17/24	9	the magazine having a toroidal or part-toroidal shape<br><br><u>NOTE</u><br><br>Group G11B17/30 takes precedence over groups G11B17/24&#160;-&#160;G11B17/28. 	G11B17/24	G11B17/24		246
G11B17/26	9	the magazine having a cylindrical shape with vertical axis	G11B17/26	G11B17/26		377
G11B17/28	9	the magazine having a cylindrical shape with horizontal axis	G11B17/28	G11B17/28		144
G11B17/30	9	wherein the playing unit is moved according to the location of the selected record	G11B17/30	G11B17/30		329
G11B17/32	8	Maintaining desired spacing between record carrier and head, e.g. by fluid-dynamic spacing {(damping of vibrations of record carriers on turntables by fluid-dynamic means G11B19/2018)}	G11B17/32	G11B17/32		744
G11B17/34	8	Guiding record carriers during transducing operation, e.g. for track following (G11B17/32 takes precedence)	G11B17/34	G11B17/34		176
G11B19/00	7	Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function {; Driving both disc and head}	G11B19/00	G11B19/00		744
G11B19/02	8	Control of operating function, e.g. switching from recording to reproducing	G11B19/02	G11B19/02		3313
G11B19/022	9	{Control panels}	G11B19/02	G11B19/02		435
G11B19/025	10	{&apos;Virtual&apos; control panels, e.g. Graphical User Interface [GUI]}	G11B19/02	G11B19/02		441
G11B19/027	9	{Remotely controlled (remote control systems in general G08C)}	G11B19/02	G11B19/02		290
G11B19/04	9	Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions	G11B19/04	G11B19/04		2254
G11B19/041	10	{Detection or prevention of read or write errors}	G11B19/04	G11B19/04		247
G11B19/042	11	{due to external shock or vibration}	G11B19/04	G11B19/04		244
G11B19/043	11	{by detecting a free-fall condition}	G11B19/04	G11B19/04		89
G11B19/044	11	{by using a data buffer}	G11B19/04	G11B19/04		82
G11B19/045	11	{by detecting mistracking}	G11B19/04	G11B19/04		135
G11B19/046	10	{Detection or prevention or problems due to temperature}	G11B19/04	G11B19/04		122
G11B19/047	10	{Recovery from power failure}	G11B19/04	G11B19/04		66
G11B19/048	10	{Testing of disk drives, e.g. to detect defects or prevent sudden failure}	G11B19/04	G11B19/04		326
G11B19/06	9	by counting or timing of machine operations	G11B19/06	G11B19/06		486
G11B19/08	9	by using devices external to the driving mechanisms, e.g. coin-freed switch (coin actuated mechanisms G07F5/00)	G11B19/08	G11B19/08		135
G11B19/10	9	by sensing presence or absence of record in accessible stored position or on turntable	G11B19/10	G11B19/10		510
G11B19/12	9	by sensing distinguishing features of {or on} records, e.g. diameter {end mark}	G11B19/12	G11B19/12		1618
G11B2019/121	10	{by photo-electric sensing}	G11B19/12	G11B19/12		61
G11B19/122	10	{involving the detection of an identification or authentication mark (record carriers indicating unauthorised or prior use G11B23/28)}	G11B19/12	G11B19/12		527
G11B19/124	10	{involving the detection of diameter of disks (feeding or guiding of a single record carrier G11B17/04 and subgroups)}	G11B19/12	G11B19/12		138
G11B19/125	10	{involving the detection of carrier data format}	G11B19/12	G11B19/12		196
G11B19/127	10	{involving detection of the number of sides, e.g. single or double, or layers, e.g. for multiple recording or reproducing layers}	G11B19/12	G11B19/12		71
G11B19/128	10	{involving the detection of track pitch or recording density}	G11B19/12	G11B19/12		107
G11B19/14	9	by sensing movement or position of head, e.g. means moving in correspondence with head movements	G11B19/14	G11B19/14		322
G11B19/16	9	Manual control	G11B19/16	G11B19/16		182
G11B19/165	10	{by closing the cover}	G11B19/16	G11B19/16		34
G11B19/18	10	Manual action on one element producing control effect indirectly by consequent action of driving mechanism	G11B19/18	G11B19/18		32
G11B19/20	8	Driving; Starting; Stopping; Control thereof	G11B19/20	G11B19/20		2354
G11B19/2009	9	{Turntables, hubs and motors for disk drives; Mounting of motors in the drive (means for clamping of disk to turntable G11B17/022 and subgroups)}	G11B19/20	G11B19/20		3571
G11B19/2018	10	{Incorporating means for passive damping of vibration, either in the turntable, motor or mounting}	G11B19/20	G11B19/20		572
G11B19/2027	10	{Turntables or rotors incorporating balancing means; Means for detecting imbalance}	G11B19/20	G11B19/20		283
G11B19/2036	10	{Motors characterized by fluid-dynamic bearings}	G11B19/20	G11B19/20		647
G11B19/2045	10	{Hubs}	G11B19/20	G11B19/20		178
G11B19/2054	9	{Spindle motor power-up sequences}	G11B19/20	G11B19/20		100
G11B19/2063	9	{Spindle motor power-down sequences}	G11B19/20	G11B19/20		47
G11B19/2072	10	{for the reduction of power consumption during idle time}	G11B19/20	G11B19/20		34
G11B19/2081	10	{emergency power-down}	G11B19/20	G11B19/20		41
G11B19/209	9	{in multiple disk arrays, e.g. spindle synchronisation in RAID systems}	G11B19/20	G11B19/20		73
G11B19/22	9	Brakes other than speed-regulating brakes	G11B19/22	G11B19/22		210
G11B19/24	9	Arrangements for providing constant relative speed between record carrier and head	G11B19/24	G11B19/24		279
G11B19/247	10	using electrical means	G11B19/247	G11B19/247		242
G11B19/253	10	using mechanical means	G11B19/253	G11B19/253		12
G11B19/26	9	Speed-changing arrangements; Reversing arrangements; Drive-transfer means therefor	G11B19/26	G11B19/26		500
G11B19/265	10	Friction wheel drive	G11B19/265	G11B19/265		662
G11B19/27	10	Belt drive	G11B19/27	G11B19/27		22
G11B19/275	10	Gear wheel drive	G11B19/275	G11B19/275		60
G11B19/28	9	Speed controlling, regulating, or indicating (G11B19/24 takes precedence)	G11B19/28	G11B19/28		2095
G11B20/00	7	Signal processing not specific to the method of recording or reproducing; Circuits therefor	G11B20/00	G11B20/00		762
G11B20/00007	8	{Time or data compression or expansion (audio compression based on psychoacoustics G10L19/00; data processing for reproducing audio data at different playback speeds G10L21/04; video compression  H04N19/00; data compression per seH03M7/30)}	G11B20/00	G11B20/00		1477
G11B2020/00014	9	{the compressed signal being an audio signal}	G11B20/00	G11B20/00		242
G11B2020/00021	10	{lossless audio compression}	G11B20/00	G11B20/00		4
G11B2020/00028	10	{Advanced audio coding [AAC]}	G11B20/00	G11B20/00		41
G11B2020/00036	10	{AC-3, i.e. ATSC digital audio compression standard}	G11B20/00	G11B20/00		31
G11B2020/00043	10	{Adaptive transform acoustic coding [ATRAC]}	G11B20/00	G11B20/00		37
G11B2020/0005	10	{DTS audio codecs}	G11B20/00	G11B20/00		12
G11B2020/00057	10	{MPEG-1 or MPEG-2 audio layer III [MP3]}	G11B20/00	G11B20/00		568
G11B2020/00065	10	{Sigma-delta audio encoding}	G11B20/00	G11B20/00		67
G11B2020/00072	9	{the compressed signal including a video signal}	G11B20/00	G11B20/00		196
G11B2020/00079	9	{the compression ratio or quality level being adapted to circumstances, e.g. to the available recording space}	G11B20/00	G11B20/00		74
G11B20/00086	8	{Circuits for prevention of unauthorised reproduction or copying, e.g. piracy (indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00)}	G11B20/00	G11B20/00		4499
G11B20/00094	9	{involving measures which result in a restriction to authorised record carriers}	G11B20/00	G11B20/00		357
G11B20/00101	10	{the original record carrier having a larger recording capacity than the potential target medium}	G11B20/00	G11B20/00		7
G11B20/00108	10	{wherein original, non-rewritable record carriers are recognised by trying to erase recorded data}	G11B20/00	G11B20/00		9
G11B20/00115	10	{wherein the record carrier stores a unique medium identifier}	G11B20/00	G11B20/00		394
G11B20/00123	10	{the record carrier being identified by recognising some of its unique characteristics, e.g. a unique defect pattern serving as a physical signature of the record carrier}	G11B20/00	G11B20/00		309
G11B20/0013	10	{wherein the measure concerns not the entire record carrier, but a specific physical or logical area of one or more record carriers}	G11B20/00	G11B20/00		30
G11B20/00137	9	{involving measures which result in a restriction to contents recorded on or reproduced from a record carrier to authorised users}	G11B20/00	G11B20/00		169
G11B20/00144	10	{involving a user identifier, e.g. a unique customer ID}	G11B20/00	G11B20/00		130
G11B20/00152	10	{involving a password}	G11B20/00	G11B20/00		305
G11B20/00159	10	{Parental control systems}	G11B20/00	G11B20/00		116
G11B20/00166	9	{involving measures which result in a restriction to authorised contents recorded on or reproduced from a record carrier, e.g. music or software}	G11B20/00	G11B20/00		228
G11B20/00173	10	{wherein the origin of the content is checked, e.g. determining whether the content has originally been retrieved from a legal disc copy or another trusted source}	G11B20/00	G11B20/00		266
G11B20/00181	10	{using a content identifier, e.g. an international standard recording code [ISRC] or a digital object identifier [DOI]}	G11B20/00	G11B20/00		176
G11B20/00188	9	{involving measures which result in a restriction to authorised devices recording or reproducing contents to/from a record carrier}	G11B20/00	G11B20/00		221
G11B20/00195	10	{using a device identifier associated with the player or recorder, e.g. serial numbers of playback apparatuses or MAC addresses}	G11B20/00	G11B20/00		197
G11B20/00202	10	{wherein the copy protection scheme builds on multi-session recording, e.g. defective table of contents [TOC] in the 2nd session}	G11B20/00	G11B20/00		40
G11B20/0021	9	{involving encryption or decryption of contents recorded on or reproduced from a record carrier}	G11B20/00	G11B20/00		1768
G11B20/00217	10	{the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source (key distribution or management H04L9/08)}	G11B20/00	G11B20/00		40
G11B20/00224	11	{wherein the key is obtained from a remote server}	G11B20/00	G11B20/00		212
G11B20/00231	11	{wherein the key is obtained from a local external medium, e.g. a card}	G11B20/00	G11B20/00		75
G11B20/00239	11	{wherein the key is provided by a software application accessing the medium}	G11B20/00	G11B20/00		8
G11B20/00246	11	{wherein the key is obtained from a local device, e.g. device key initially stored by the player or by the recorder}	G11B20/00	G11B20/00		304
G11B20/00253	11	{wherein the key is stored on the record carrier}	G11B20/00	G11B20/00		282
G11B20/0026	12	{the key being stored as a barcode}	G11B20/00	G11B20/00		28
G11B20/00268	13	{said barcode being recorded in a burst cutting area [BCA]}	G11B20/00	G11B20/00		75
G11B20/00275	12	{the key being stored on a chip attached to the record carrier}	G11B20/00	G11B20/00		76
G11B20/00282	12	{the key being stored in the content area, e.g. program area, data area or user area (key stored in a management area G11B20/00297)}	G11B20/00	G11B20/00		73
G11B20/00289	13	{wherein the key is stored as a watermark}	G11B20/00	G11B20/00		30
G11B20/00297	12	{the key being stored in a management area, e.g. the video manager [VMG] of a DVD}	G11B20/00	G11B20/00		35
G11B20/00304	13	{the key being stored in the lead-in area [LIA]}	G11B20/00	G11B20/00		86
G11B20/00311	13	{the key being stored in the lead-out area [LOA]}	G11B20/00	G11B20/00		12
G11B20/00318	13	{the key being stored in the TOC}	G11B20/00	G11B20/00		20
G11B20/00326	12	{the key being embossed on the record carrier}	G11B20/00	G11B20/00		40
G11B20/00333	12	{the key being stored in header data, e.g. in sector headers}	G11B20/00	G11B20/00		51
G11B20/0034	12	{the key being stored as a hologram}	G11B20/00	G11B20/00		2
G11B20/00347	12	{wherein the medium identifier is used as a key}	G11B20/00	G11B20/00		102
G11B20/00355	12	{the record carrier having a label that provides the key}	G11B20/00	G11B20/00		11
G11B20/00362	12	{the key being obtained from a media key block [MKB]}	G11B20/00	G11B20/00		140
G11B20/00369	12	{wherein a first key, which is usually stored on a hidden channel, e.g. in the lead-in of a BD-R, unlocks a key locker containing a second}	G11B20/00	G11B20/00		34
G11B20/00376	12	{the key being stored by varying the pit format, e.g. depth, width, length or edge positions}	G11B20/00	G11B20/00		23
G11B20/00384	12	{the key being derived from a physical signature of the record carrier, e.g. unique feature set}	G11B20/00	G11B20/00		18
G11B20/00391	12	{the key being stored in subcodes, e.g. in the Q subcode of a CD}	G11B20/00	G11B20/00		5
G11B20/00398	12	{the key being stored in sync patterns}	G11B20/00	G11B20/00		5
G11B20/00405	12	{the key being stored by varying characteristics of the recording track, e.g. by altering the track pitch or by modulating the wobble track}	G11B20/00	G11B20/00		51
G11B20/00413	11	{wherein the key is input by a user}	G11B20/00	G11B20/00		70
G11B20/0042	10	{the copy protection scheme being related to a specific access protection standard}	G11B20/00	G11B20/00		2
G11B20/00427	11	{advanced access content system [AACS]}	G11B20/00	G11B20/00		107
G11B20/00434	11	{content protection for pre-recorded media [CPPM]}	G11B20/00	G11B20/00		2
G11B20/00442	11	{content protection for recordable media [CPRM]}	G11B20/00	G11B20/00		27
G11B20/00449	11	{content scrambling system [CSS]}	G11B20/00	G11B20/00		123
G11B20/00456	11	{digital transmission content protection [DTCP]}	G11B20/00	G11B20/00		9
G11B20/00463	11	{high-bandwidth digital content protection [HDCP]}	G11B20/00	G11B20/00		20
G11B20/00471	11	{video content protection system [VCPS]}	G11B20/00	G11B20/00		3
G11B20/00478	10	{wherein contents are decrypted and re-encrypted with a different key when being copied from/to a record carrier}	G11B20/00	G11B20/00		72
G11B20/00485	10	{characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier}	G11B20/00	G11B20/00		7
G11B20/00492	11	{wherein content or user data is encrypted}	G11B20/00	G11B20/00		223
G11B20/005	12	{wherein only some specific parts of the content are encrypted, e.g. encryption limited to I-frames}	G11B20/00	G11B20/00		15
G11B20/00507	12	{wherein consecutive physical data units of the record carrier are encrypted with separate encryption keys, e.g. the key changes on a cluster or sector basis}	G11B20/00	G11B20/00		178
G11B20/00514	12	{wherein the entire content is encrypted with the same key, e.g. disc key or master key}	G11B20/00	G11B20/00		57
G11B20/00521	12	{wherein each session of a multisession recording medium is encrypted with a separate encryption key}	G11B20/00	G11B20/00		28
G11B20/00528	12	{wherein each title is encrypted with a separate encryption key for each title, e.g. title key for movie, song or data file}	G11B20/00	G11B20/00		199
G11B20/00536	12	{wherein encrypted content data is subjected to a further, iterated encryption, e.g. interwoven encryption}	G11B20/00	G11B20/00		66
G11B20/00543	11	{wherein external data is encrypted, e.g. for secure communication with an external device or for encrypting content on a separate record carrier}	G11B20/00	G11B20/00		35
G11B20/0055	11	{wherein license data is encrypted}	G11B20/00	G11B20/00		8
G11B20/00557	11	{wherein further management data is encrypted, e.g. sector headers, TOC or the lead-in or lead-out areas}	G11B20/00	G11B20/00		188
G11B20/00565	11	{wherein parity data is encrypted}	G11B20/00	G11B20/00		2
G11B20/00572	9	{involving measures which change the format of the recording medium}	G11B20/00	G11B20/00		4
G11B20/00579	10	{said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns}	G11B20/00	G11B20/00		115
G11B20/00586	10	{said format change concerning the physical format of the recording medium}	G11B20/00	G11B20/00		222
G11B20/00594	11	{wherein the shape of recording marks is altered, e.g. the depth, width, or length of pits}	G11B20/00	G11B20/00		86
G11B20/00601	11	{wherein properties of tracks are altered, e.g., by changing the wobble pattern or the track pitch, or by adding interruptions or eccentricity}	G11B20/00	G11B20/00		89
G11B20/00608	11	{wherein the material that the record carrier is made of is altered, e.g. adding reactive dyes that alter the optical properties of a disc after prolonged exposure to light or air}	G11B20/00	G11B20/00		75
G11B20/00615	10	{said format change concerning the logical format of the recording medium, e.g. the structure of sectors, blocks, or frames}	G11B20/00	G11B20/00		64
G11B20/00623	11	{wherein the modification to the logical format directly concerns user data}	G11B20/00	G11B20/00		10
G11B20/0063	11	{wherein the modification to the logical format mainly concerns management data, e.g., by changing the format of the TOC or the subcode}	G11B20/00	G11B20/00		83
G11B20/00637	12	{said management data being address data}	G11B20/00	G11B20/00		18
G11B20/00644	13	{the address data format being such that there are overlapping address ranges}	G11B20/00	G11B20/00		8
G11B20/00652	13	{the address data being scrambled so that ascending address values do not reflect the physical order of data blocks}	G11B20/00	G11B20/00		7
G11B20/00659	9	{involving a control step which is implemented as an executable file stored on the record carrier}	G11B20/00	G11B20/00		125
G11B20/00666	9	{involving a step of erasing or nullifying data, e.g. data being overwritten with a random string}	G11B20/00	G11B20/00		143
G11B20/00673	10	{wherein the erased or nullified data include a cryptographic key}	G11B20/00	G11B20/00		38
G11B20/00681	9	{involving measures which prevent a specific kind of data access}	G11B20/00	G11B20/00		5
G11B20/00688	10	{said measures preventing that a usable copy of recorded data can be made on another medium}	G11B20/00	G11B20/00		162
G11B20/00695	10	{said measures preventing that data are read from the recording medium}	G11B20/00	G11B20/00		222
G11B20/00702	10	{said measures preventing that data are recorded on the recording medium}	G11B20/00	G11B20/00		84
G11B20/0071	9	{involving a purchase action}	G11B20/00	G11B20/00		257
G11B20/00717	10	{wherein accounting and payment are postponed, e.g. until the player can establish a network connection to the service provider}	G11B20/00	G11B20/00		5
G11B20/00724	10	{wherein a prepaid credit balance is registered on the recording medium}	G11B20/00	G11B20/00		38
G11B20/00731	9	{involving a digital rights management system for enforcing a usage restriction}	G11B20/00	G11B20/00		201
G11B20/00739	10	{wherein the usage restriction is associated with a specific geographical region}	G11B20/00	G11B20/00		60
G11B20/00746	10	{wherein the usage restriction can be expressed as a specific number}	G11B20/00	G11B20/00		161
G11B20/00753	11	{wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags}	G11B20/00	G11B20/00		200
G11B20/0076	12	{wherein the copy frequency, i.e. the number of copies in a given time period, is limited}	G11B20/00	G11B20/00		13
G11B20/00768	12	{wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags}	G11B20/00	G11B20/00		325
G11B20/00775	13	{wherein said copy control information is encoded in an encryption mode indicator [EMI]}	G11B20/00	G11B20/00		25
G11B20/00782	11	{wherein the usage restriction limits the number of times a program can be installed}	G11B20/00	G11B20/00		14
G11B20/00789	11	{wherein the usage restriction limits the number of functional copies, which can be accessed at a time, e.g. electronic bookshelf concept, virtual library, video rentals or check-in/check out}	G11B20/00	G11B20/00		35
G11B20/00797	11	{wherein the usage restriction limits the number of times a content can be reproduced, e.g. using playback counters}	G11B20/00	G11B20/00		112
G11B20/00804	11	{wherein the usage restriction limits the number of users or devices that are allowed to access a given content}	G11B20/00	G11B20/00		19
G11B20/00811	11	{wherein said number is encoded as a cryptographic token or ticket}	G11B20/00	G11B20/00		11
G11B20/00818	10	{wherein the usage restriction limits the signal quality, e.g. by low-pass filtering of audio signals or by reducing the resolution of video signals}	G11B20/00	G11B20/00		77
G11B20/00826	11	{wherein a spoiler signal is added to degrade the signal quality}	G11B20/00	G11B20/00		68
G11B20/00833	10	{wherein the usage restriction limits the data access speed, e.g. by defining a maximum bit rate of the I/O interface}	G11B20/00	G11B20/00		4
G11B20/0084	10	{wherein the usage restriction can be expressed as a specific time or date}	G11B20/00	G11B20/00		257
G11B20/00847	10	{wherein the usage restriction is defined by a licence file}	G11B20/00	G11B20/00		86
G11B20/00855	9	{involving a step of exchanging information with a remote server}	G11B20/00	G11B20/00		243
G11B20/00862	10	{wherein the remote server can grant the permission to use a content}	G11B20/00	G11B20/00		110
G11B20/00869	10	{wherein the remote server can deliver the content to a receiving device}	G11B20/00	G11B20/00		140
G11B20/00876	9	{wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry}	G11B20/00	G11B20/00		332
G11B20/00884	9	{involving a watermark, i.e. a barely perceptible transformation of the original data which can nevertheless be recognised by an algorithm}	G11B20/00	G11B20/00		552
G11B20/00891	10	{embedded in audio data}	G11B20/00	G11B20/00		211
G11B20/00898	10	{based on a hash function}	G11B20/00	G11B20/00		18
G11B20/00905	10	{multiple watermarks used in combination}	G11B20/00	G11B20/00		19
G11B20/00913	10	{based on a spread spectrum technique}	G11B20/00	G11B20/00		42
G11B20/0092	9	{involving measures which are linked to media defects or read/write errors}	G11B20/00	G11B20/00		56
G11B20/00927	10	{wherein said defects or errors are generated on purpose, e.g. intended scratches}	G11B20/00	G11B20/00		246
G11B20/00934	11	{said intentional errors occurring because of corrupted address information}	G11B20/00	G11B20/00		12
G11B20/00942	11	{said intentional errors occurring due to an invalid playback path or program chain}	G11B20/00	G11B20/00		11
G11B20/00949	11	{said intentional errors occurring due to bad sectors, which are either physically destroyed or which are declared defective in the defect management information}	G11B20/00	G11B20/00		44
G11B20/00956	11	{said intentional errors occurring due to an invalid TOC}	G11B20/00	G11B20/00		23
G11B20/00963	10	{wherein said defects or errors are not generated on purpose, e.g. random defect patterns occurring during the normal manufacture}	G11B20/00	G11B20/00		22
G11B20/00971	9	{involving measures for monitoring the industrial media production and distribution channels, e.g. for controlling content providers or the official manufacturers or replicators of recording media}	G11B20/00	G11B20/00		24
G11B20/00978	9	{wherein the record carrier stores a trial version of a content}	G11B20/00	G11B20/00		28
G11B20/00985	10	{the trial version being of lower quality than the original version}	G11B20/00	G11B20/00		13
G11B20/00992	8	{Circuits for stereophonic or quadraphonic recording or reproducing}	G11B20/00	G11B20/00		329
G11B20/02	8	Analogue recording or reproducing	G11B20/02	G11B20/02		748
G11B20/025	9	{Error detection or correction}	G11B20/02	G11B20/02		141
G11B20/04	9	Direct recording or reproducing	G11B20/04	G11B20/04		424
G11B20/06	9	Angle-modulation recording or reproducing	G11B20/06	G11B20/06		374
G11B20/08	9	Pulse-modulation recording or reproducing (pulse-code-modulation recording G11B20/10)	G11B20/08	G11B20/08		125
G11B20/10	8	Digital recording or reproducing	G11B20/10	G11B20/10		9362
G11B20/10009	9	{Improvement or modification of read or write signals}	G11B20/10	G11B20/10		4243
G11B20/10018	10	{analog processing for digital recording or reproduction (G11B20/10037&#160;-&#160;G11B20/10481 take precedence)}	G11B20/10	G11B20/10		256
G11B20/10027	11	{adjusting the signal strength during recording or reproduction, e.g. variable gain amplifiers (optimum power control for optical discs G11B7/125)}	G11B20/10	G11B20/10		671
G11B20/10037	10	{A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof}	G11B20/10	G11B20/10		1652
G11B20/10046	10	{filtering or equalising, e.g. setting the tap weights of an FIR filter}	G11B20/10	G11B20/10		1303
G11B20/10055	11	{using partial response filtering when writing the signal to the medium or reading it therefrom}	G11B20/10	G11B20/10		563
G11B20/10064	12	{EEPR4 or E2PR4, i.e. extended partial response class 4, polynomial (1-D)*(1+D)3}	G11B20/10	G11B20/10		21
G11B20/10074	12	{EPR4, i.e. extended partial response class 4, polynomial (1-D) *(1+D)2}	G11B20/10	G11B20/10		44
G11B20/10083	12	{PR1 or PR(1,1,), i.e. partial response class 1, polynomial 1+D}	G11B20/10	G11B20/10		40
G11B20/10092	12	{partial response PR(1,1,1,1)}	G11B20/10	G11B20/10		8
G11B20/10101	12	{PR2 or PR(1,2,1), i.e. partial response class 2, polynomial (1+D)2=1+2D+D2}	G11B20/10	G11B20/10		84
G11B20/10111	12	{partial response PR(1,2,2,1)}	G11B20/10	G11B20/10		93
G11B20/1012	12	{partial response PR(1,2,2,2,1)}	G11B20/10	G11B20/10		69
G11B20/10129	12	{partial response PR(1,2,3,3,2,1)}	G11B20/10	G11B20/10		1
G11B20/10138	12	{partial response PR (2,3,3,2)}	G11B20/10	G11B20/10		1
G11B20/10148	12	{partial response PR(1,3,3,1)}	G11B20/10	G11B20/10		19
G11B20/10157	12	{PR3 or PR(2,1,-1), i.e. partial response class 3, polynomial (1+D)(2-D)=2+D-D2}	G11B20/10	G11B20/10		
G11B20/10166	12	{partial response PR(3,4,4,3)}	G11B20/10	G11B20/10		17
G11B20/10175	12	{PR4, PR(1,0,-1), i.e. partial response class 4, polynomial (1+D)(1-D)=(1-D2)}	G11B20/10	G11B20/10		65
G11B20/10185	12	{PR5 or PR(-1,0,2,0,-1), i.e. partial response class 5, polynomial -((1+D)2) *((1-D)2) =-1+2D2-D4}	G11B20/10	G11B20/10		1
G11B20/10194	11	{using predistortion during writing (G11B20/10055 takes precedence)}	G11B20/10	G11B20/10		204
G11B20/10203	11	{baseline correction (DC correction by choosing codewords of the modulation code G11B20/1426)}	G11B20/10	G11B20/10		258
G11B20/10212	11	{compensation for data shift, e.g. pulse-crowding effects}	G11B20/10	G11B20/10		316
G11B20/10222	10	{clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation (dedicated sync patterns in the modulation code G11B20/1403)}	G11B20/10	G11B20/10		736
G11B20/10231	11	{wherein an asynchronous, free-running clock is used; Interpolation of sampled signals}	G11B20/10	G11B20/10		102
G11B20/1024	11	{wherein a phase-locked loop [PLL] is used}	G11B20/10	G11B20/10		185
G11B20/1025	12	{the PLL being discrete time or digital PLL}	G11B20/10	G11B20/10		38
G11B20/10259	11	{simultaneous timing recovery for multiple parallel tracks}	G11B20/10	G11B20/10		34
G11B20/10268	10	{bit detection or demodulation methods}	G11B20/10	G11B20/10		308
G11B20/10277	11	{the demodulation process being specifically adapted to partial response channels, e.g. PRML decoding}	G11B20/10	G11B20/10		74
G11B20/10287	11	{using probabilistic methods, e.g. maximum likelihood detectors (G11B20/10277 takes precedence)}	G11B20/10	G11B20/10		80
G11B20/10296	12	{using the Viterbi algorithm}	G11B20/10	G11B20/10		408
G11B20/10305	10	{signal quality assessment}	G11B20/10	G11B20/10		137
G11B20/10314	11	{amplitude of the recorded or reproduced signal}	G11B20/10	G11B20/10		74
G11B20/10324	11	{asymmetry of the recorded or reproduced waveform}	G11B20/10	G11B20/10		43
G11B20/10333	12	{wherein the asymmetry is linked to domain bloom}	G11B20/10	G11B20/10		22
G11B20/10342	11	{sub-information or auxiliary signals different from the normal recording marks, e.g. signals reproduced from wobble tracks}	G11B20/10	G11B20/10		27
G11B20/10351	11	{baseline shift, DC content, bias}	G11B20/10	G11B20/10		34
G11B20/10361	11	{digital demodulation process}	G11B20/10	G11B20/10		40
G11B20/1037	12	{based on hard decisions, e.g. by evaluating bit error rates before or after ECC decoding}	G11B20/10	G11B20/10		62
G11B20/10379	12	{based on soft decisions, e.g. confidence values, probability estimates, likelihoods values or path metrics of a statistical decoding algorithm}	G11B20/10	G11B20/10		35
G11B20/10388	11	{control of the read or write heads, e.g. tracking errors, defocus or tilt compensation}	G11B20/10	G11B20/10		352
G11B20/10398	11	{jitter, timing deviations or phase and frequency errors}	G11B20/10	G11B20/10		210
G11B20/10407	12	{by verifying the timing of signal transitions, e.g. rising or falling edges, or by analysing signal slopes}	G11B20/10	G11B20/10		40
G11B20/10416	12	{by verifying the timing of peak values}	G11B20/10	G11B20/10		6
G11B20/10425	12	{by counting out-of-lock events of a PLL}	G11B20/10	G11B20/10		351
G11B20/10435	12	{by verifying the timing of predetermined signal patterns, e.g. sync patterns}	G11B20/10	G11B20/10		26
G11B20/10444	12	{by verifying the timing of zero crossings}	G11B20/10	G11B20/10		46
G11B20/10453	11	{physical shape of recording marks, e.g. their length, width, depth or contour}	G11B20/10	G11B20/10		17
G11B20/10462	11	{consistency with a reference waveform in a given time period, e.g. by calculating correlations or mean square errors}	G11B20/10	G11B20/10		40
G11B20/10472	11	{derived from statistics of other quality measures, e.g. their mean, variance or skew}	G11B20/10	G11B20/10		45
G11B20/10481	10	{optimisation methods}	G11B20/10	G11B20/10		527
G11B20/1049	11	{using closed-form solutions}	G11B20/10	G11B20/10		5
G11B20/105	11	{selecting parameter values from a plurality of predetermined settings}	G11B20/10	G11B20/10		52
G11B20/10509	11	{iterative methods, e.g. trial-and-error, interval search, gradient descent or feedback loops (G11B20/10518 takes precedence)}	G11B20/10	G11B20/10		108
G11B20/10518	11	{using neural networks}	G11B20/10	G11B20/10		29
G11B20/10527	9	{Audio or video recording; Data buffering arrangements (G11B20/12&#160;-&#160;G11B20/18 take precedence)}	G11B20/10	G11B20/10		6343
G11B2020/10537	10	{Audio or video recording}	G11B20/10	G11B20/10		995
G11B2020/10546	11	{specifically adapted for audio data}	G11B20/10	G11B20/10		1681
G11B2020/10555	12	{wherein the frequency, the amplitude, or other characteristics of the audio signal is taken into account}	G11B20/10	G11B20/10		126
G11B2020/10564	13	{frequency}	G11B20/10	G11B20/10		96
G11B2020/10574	13	{volume or amplitude}	G11B20/10	G11B20/10		138
G11B2020/10583	13	{parameters controlling audio interpolation processes}	G11B20/10	G11B20/10		22
G11B2020/10592	11	{specifically adapted for recording or reproducing multichannel signals}	G11B20/10	G11B20/10		542
G11B2020/10601	12	{surround sound signal}	G11B20/10	G11B20/10		64
G11B2020/10611	12	{3D video data}	G11B20/10	G11B20/10		24
G11B2020/1062	10	{Data buffering arrangements, e.g. recording or playback buffers}	G11B20/10	G11B20/10		609
G11B2020/10629	11	{the buffer having a specific structure}	G11B20/10	G11B20/10		59
G11B2020/10638	12	{First-in-first-out memories [FIFO] buffers}	G11B20/10	G11B20/10		111
G11B2020/10648	12	{First-in-last-out memories [LIFO] buffers}	G11B20/10	G11B20/10		2
G11B2020/10657	12	{Cache memories for random data access, e.g. buffers wherein the data output is controlled by a priority parameter other than retention time}	G11B20/10	G11B20/10		33
G11B2020/10666	12	{Ring buffers, e.g. buffers wherein an iteratively progressing read or write pointer moves back to the beginning of the buffer when reaching the last storage cell}	G11B20/10	G11B20/10		110
G11B2020/10675	11	{aspects of buffer control}	G11B20/10	G11B20/10		191
G11B2020/10685	12	{input interface, i.e. the way data enter the buffer, e.g. by informing the sender that the buffer is busy}	G11B20/10	G11B20/10		127
G11B2020/10694	12	{output interface, i.e. the way data leave the buffer, e.g. by adjusting the clock rate}	G11B20/10	G11B20/10		110
G11B2020/10703	12	{processing rate of the buffer, e.g. by accelerating the data output}	G11B20/10	G11B20/10		90
G11B2020/10712	12	{buffer capacity, e.g. when the buffer capacity is exhausted, buffered data are overwritten with more recent data, accepting that the old data are lost}	G11B20/10	G11B20/10		40
G11B2020/10722	12	{wherein the size of the buffer is variable, e.g. by adding additional memory cells for coping with input streams that have high bit rates}	G11B20/10	G11B20/10		59
G11B2020/10731	12	{wherein the buffer I/O can be temporarily suspended, e.g. by refusing to accept further data to be buffered}	G11B20/10	G11B20/10		49
G11B2020/1074	12	{involving a specific threshold value}	G11B20/10	G11B20/10		117
G11B2020/1075	11	{the usage of the buffer being restricted to a specific kind of data}	G11B20/10	G11B20/10		18
G11B2020/10759	12	{content data}	G11B20/10	G11B20/10		309
G11B2020/10768	13	{by pre-caching the initial portion of songs or other recorded or downloaded data for starting playback instantly}	G11B20/10	G11B20/10		112
G11B2020/10777	12	{instructions or commands}	G11B20/10	G11B20/10		40
G11B2020/10787	12	{parameters, e.g. for decoding or encoding}	G11B20/10	G11B20/10		65
G11B2020/10796	12	{address data}	G11B20/10	G11B20/10		40
G11B2020/10805	11	{involving specific measures to prevent a buffer overflow}	G11B20/10	G11B20/10		105
G11B2020/10814	11	{involving specific measures to prevent a buffer underrun}	G11B20/10	G11B20/10		222
G11B2020/10824	11	{the buffer being used to prevent vibrations or shocks from causing delays}	G11B20/10	G11B20/10		26
G11B2020/10833	9	{Copying or moving data from one record carrier to another}	G11B20/10	G11B20/10		313
G11B2020/10842	10	{wherein not all recorded data are copied or moved}	G11B20/10	G11B20/10		39
G11B2020/10851	9	{Erasing data on the record carrier}	G11B20/10	G11B20/10		78
G11B2020/10861	9	{Finalising a record carrier after a recording operation, e.g. to ensure compatibility with a ROM medium}	G11B20/10	G11B20/10		72
G11B2020/1087	9	{wherein a selection is made among at least two alternative ways of processing}	G11B20/10	G11B20/10		96
G11B2020/10879	10	{the kind of record carrier being the selection criterion}	G11B20/10	G11B20/10		87
G11B2020/10888	10	{the kind of data being the selection criterion}	G11B20/10	G11B20/10		77
G11B2020/10898	9	{Overwriting or replacing recorded data}	G11B20/10	G11B20/10		131
G11B2020/10907	10	{using pseudo-overwriting, i.e. virtually or logically overwriting data on WORM media by remapping recorded blocks to alternate areas}	G11B20/10	G11B20/10		92
G11B2020/10916	9	{Seeking data on the record carrier for preparing an access to a specific address}	G11B20/10	G11B20/10		372
G11B2020/10925	10	{involving an inter-layer jump, i.e. changing from one recording layer to another}	G11B20/10	G11B20/10		52
G11B2020/10935	9	{wherein a time constraint must be met}	G11B20/10	G11B20/10		97
G11B2020/10944	10	{Real-time recording or reproducing, e.g. for ensuring seamless playback of AV data}	G11B20/10	G11B20/10		283
G11B2020/10953	10	{Concurrent recording or playback of different streams or files}	G11B20/10	G11B20/10		68
G11B2020/10962	11	{wherein both recording and playback take place simultaneously}	G11B20/10	G11B20/10		97
G11B2020/10972	10	{Management of interruptions, e.g. due to editing}	G11B20/10	G11B20/10		97
G11B2020/10981	10	{Recording or reproducing data when the data rate or the relative speed between record carrier and transducer is variable}	G11B20/10	G11B20/10		90
G11B2020/1099	11	{wherein a disc is spun at a variable speed}	G11B20/10	G11B20/10		47
G11B20/12	9	Formatting, e.g. arrangement of data block or words on the record carriers {(within interface between computers and data recorders G06F3/06)}	G11B20/12	G11B20/12		1891
G11B20/1201	10	{on tapes}	G11B20/12	G11B20/12		293
G11B20/1202	11	{with longitudinal tracks only}	G11B20/12	G11B20/12		79
G11B20/1204	12	{for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data}	G11B20/12	G11B20/12		39
G11B20/1205	12	{for discontinuous data, e.g. digital information signals or computer program data}	G11B20/12	G11B20/12		105
G11B20/1207	11	{with transverse tracks only}	G11B20/12	G11B20/12		66
G11B20/1208	12	{for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data}	G11B20/12	G11B20/12		154
G11B20/1209	12	{for discontinuous data, e.g. digital information signals or computer program data}	G11B20/12	G11B20/12		97
G11B20/1211	11	{with different data track configurations (longitudinal control tracks with transverse user data tracks G11B20/1207)}	G11B20/12	G11B20/12		65
G11B20/1212	12	{for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data}	G11B20/12	G11B20/12		4
G11B20/1214	12	{for discontinuous data, e.g. digital information signals or computer program data}	G11B20/12	G11B20/12		5
G11B20/1215	10	{on cards (optical aspect of optical cards G11B7/0033)}	G11B20/12	G11B20/12		66
G11B20/1217	10	{on discs}	G11B20/12	G11B20/12		2910
G11B2020/1218	11	{wherein the formatting concerns a specific area of the disc}	G11B20/12	G11B20/12		48
G11B2020/122	12	{Burst cutting area [BCA]}	G11B20/12	G11B20/12		71
G11B2020/1221	12	{cluster, i.e. a data structure which consists of a fixed number of sectors or ECC blocks}	G11B20/12	G11B20/12		121
G11B2020/1222	12	{ECC block, i.e. a block of error correction encoded symbols which includes all parity data needed for decoding}	G11B20/12	G11B20/12		310
G11B2020/1224	12	{extent, i.e. a set of sectors which numbers form a continuous ascending sequence}	G11B20/12	G11B20/12		24
G11B2020/1225	12	{frame, i.e. a subunit of a sector containing user data, e.g. a sync frame}	G11B20/12	G11B20/12		93
G11B2020/1227	12	{one layer of multilayer disc}	G11B20/12	G11B20/12		75
G11B2020/1228	12	{middle zone or outer guard area of a multilayer disc}	G11B20/12	G11B20/12		40
G11B2020/1229	12	{lead-in area}	G11B20/12	G11B20/12		225
G11B2020/1231	12	{lead-out area}	G11B20/12	G11B20/12		113
G11B2020/1232	12	{sector, i.e. the minimal addressable physical data unit}	G11B20/12	G11B20/12		412
G11B2020/1234	13	{wherein the sector is a headerless sector, i.e. it does not comprise an ID field}	G11B20/12	G11B20/12		48
G11B2020/1235	12	{session, i.e. a contiguous area having its own lead-in area, program area and lead-out area}	G11B20/12	G11B20/12		96
G11B2020/1237	12	{recording side of a single layer medium}	G11B20/12	G11B20/12		3
G11B2020/1238	12	{track, i.e. the entire a spirally or concentrically arranged path on which the recording marks are located}	G11B20/12	G11B20/12		263
G11B2020/1239	13	{the track being a pregroove, e.g. the wobbled track of a recordable optical disc}	G11B20/12	G11B20/12		146
G11B2020/1241	12	{user area, i.e. the area of a disc where user data are to be recorded}	G11B20/12	G11B20/12		69
G11B2020/1242	12	{the area forming one or more zones, wherein each zone is shaped like an annulus or a circular sector}	G11B20/12	G11B20/12		84
G11B2020/1244	13	{CAV zone, in which a constant angular velocity is used}	G11B20/12	G11B20/12		64
G11B2020/1245	13	{CLV zone, in which a constant linear velocity is used}	G11B20/12	G11B20/12		67
G11B2020/1247	13	{rewritable zone, e.g. a RAM zone of a hybrid disc having ROM and RAM areas}	G11B20/12	G11B20/12		20
G11B2020/1248	13	{ROM zone, i.e. an unrewritable zone}	G11B20/12	G11B20/12		23
G11B2020/1249	11	{wherein the bits are arranged on a two-dimensional hexagonal lattice}	G11B20/12	G11B20/12		20
G11B20/1251	11	{for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data}	G11B20/12	G11B20/12		347
G11B20/1252	11	{for discontinuous data, e.g. digital information signals or computer program data}	G11B20/12	G11B20/12		385
G11B20/1254	11	{for mixed data, i.e. continuous and discontinuous data}	G11B20/12	G11B20/12		114
G11B2020/1255	11	{Fixed Block Architecture [FBA] format}	G11B20/12	G11B20/12		6
G11B2020/1257	11	{Count Key Data [CKD] format}	G11B20/12	G11B20/12		18
G11B20/1258	11	{where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs}	G11B20/12	G11B20/12		573
G11B2020/1259	11	{with ROM/RAM areas}	G11B20/12	G11B20/12		155
G11B20/1261	10	{on films, e.g. for optical moving-picture soundtracks (optical aspect G11B7/0032)}	G11B20/12	G11B20/12		32
G11B20/1262	10	{with more than one format/standard, e.g. conversion from CD-audio format to R-DAT format}	G11B20/12	G11B20/12		282
G11B2020/1264	10	{wherein the formatting concerns a specific kind of data}	G11B20/12	G11B20/12		20
G11B2020/1265	11	{Control data, system data or management information, i.e. data used to access or process user data}	G11B20/12	G11B20/12		279
G11B2020/1267	12	{Address data}	G11B20/12	G11B20/12		331
G11B2020/1268	13	{Address in pregroove [ADIP] information}	G11B20/12	G11B20/12		133
G11B2020/1269	13	{Absolute time in pregroove [ATIP] information}	G11B20/12	G11B20/12		102
G11B2020/1271	13	{the address data being stored in a subcode, e.g. in the Q channel of a CD}	G11B20/12	G11B20/12		42
G11B2020/1272	14	{Burst indicator subcode [BIS]}	G11B20/12	G11B20/12		45
G11B2020/1274	13	{stored in pre-pits, i.e. in embossed pits, ROM marks or prepits}	G11B20/12	G11B20/12		95
G11B2020/1275	12	{Calibration data, e.g. specific training patterns for adjusting equalizer settings or other recording or playback parameters}	G11B20/12	G11B20/12		141
G11B2020/1277	12	{for managing gaps between two recordings, e.g. control data in linking areas, run-in or run-out fields, guard or buffer zones}	G11B20/12	G11B20/12		234
G11B2020/1278	12	{Physical format specifications of the record carrier, e.g. compliance with a specific standard, recording density, number of layers, start of data zone or lead-out}	G11B20/12	G11B20/12		152
G11B2020/1279	13	{Permanent information and control data stored in the PIC zone of a Blu-Ray disc}	G11B20/12	G11B20/12		39
G11B2020/1281	12	{Servo information}	G11B20/12	G11B20/12		203
G11B2020/1282	13	{in embedded servo fields}	G11B20/12	G11B20/12		126
G11B2020/1284	13	{in servo fields which split data fields}	G11B20/12	G11B20/12		67
G11B2020/1285	12	{Status of the record carrier, e.g. space bit maps, flags indicating a formatting status or a write permission}	G11B20/12	G11B20/12		227
G11B2020/1287	12	{Synchronisation pattern, e.g. VCO fields}	G11B20/12	G11B20/12		413
G11B2020/1288	11	{Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs}	G11B20/12	G11B20/12		425
G11B2020/1289	11	{Formatting of user data}	G11B20/12	G11B20/12		62
G11B2020/1291	10	{wherein the formatting serves a specific purpose}	G11B20/12	G11B20/12		22
G11B2020/1292	11	{Enhancement of the total storage capacity}	G11B20/12	G11B20/12		265
G11B2020/1294	11	{Increase of the access speed}	G11B20/12	G11B20/12		106
G11B2020/1295	12	{wherein the focus is on the read access speed}	G11B20/12	G11B20/12		58
G11B2020/1297	12	{wherein the focus is on the write access speed}	G11B20/12	G11B20/12		63
G11B2020/1298	11	{Enhancement of the signal quality}	G11B20/12	G11B20/12		116
G11B20/14	9	using self-clocking codes	G11B20/14	G11B20/14		465
G11B20/1403	10	{characterised by the use of two levels}	G11B20/14	G11B20/14		1331
G11B20/1407	11	{code representation depending on a single bit, i.e. where a one is always represented by a first code symbol while a zero is always represented by a second code symbol}	G11B20/14	G11B20/14		39
G11B20/1411	12	{conversion to or from pulse width coding}	G11B20/14	G11B20/14		58
G11B20/1415	12	{conversion to or from pulse frequency coding}	G11B20/14	G11B20/14		27
G11B20/1419	12	{to or from biphase level coding, i.e. to or from codes where a one is coded as a transition from a high to a low level during the middle of a bit cell and a zero is encoded as a transition from a low to a high level during the middle of a bit cell or vice versa, e.g. split phase code, Manchester code conversion to or from biphase space or mark coding, i.e. to or from codes where there is a transition at the beginning of every bit cell and a one has no second transition and a zero has a second transition one half of a bit period later or vice versa, e.g. double frequency code, FM code}	G11B20/14	G11B20/14		532
G11B20/1423	11	{Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code}	G11B20/14	G11B20/14		244
G11B20/1426	12	{conversion to or from block codes or representations thereof}	G11B20/14	G11B20/14		1450
G11B2020/143	13	{4 to 6 modulation}	G11B20/14	G11B20/14		8
G11B2020/1434	13	{8 to 9 modulation}	G11B20/14	G11B20/14		36
G11B2020/1438	13	{8 to 10 modulation}	G11B20/14	G11B20/14		30
G11B2020/1442	13	{8 to 12 modulation}	G11B20/14	G11B20/14		9
G11B2020/1446	13	{16 to 17 modulation}	G11B20/14	G11B20/14		39
G11B2020/1449	13	{24 to 25 modulation}	G11B20/14	G11B20/14		8
G11B2020/1453	13	{17PP modulation, i.e. the parity preserving RLL(1,7) code with rate 2/3 used on Blu-Ray discs}	G11B20/14	G11B20/14		52
G11B2020/1457	13	{wherein DC control is performed by calculating a digital sum value [DSV]}	G11B20/14	G11B20/14		163
G11B2020/1461	13	{8 to 14 modulation, e.g. the EFM code used on CDs or mini-discs}	G11B20/14	G11B20/14		196
G11B2020/1465	13	{8 to 16 modulation, e.g. the EFM+ code used on DVDs}	G11B20/14	G11B20/14		50
G11B2020/1469	13	{modulation code with one or more merging bits between consecutive codewords}	G11B20/14	G11B20/14		40
G11B2020/1473	13	{modulation code without any merging bits}	G11B20/14	G11B20/14		7
G11B2020/1476	11	{Synchronisation patterns; Coping with defects thereof}	G11B20/14	G11B20/14		114
G11B2020/148	12	{using error detecting or error correcting codes}	G11B20/14	G11B20/14		23
G11B2020/1484	11	{Codewords used in servo patterns}	G11B20/14	G11B20/14		38
G11B20/1488	10	{characterised by the use of three levels}	G11B20/14	G11B20/14		30
G11B20/1492	11	{two levels are symmetric, in respect of the sign to the third level which is "zero"}	G11B20/14	G11B20/14		61
G11B20/1496	10	{characterised by the use of more than three levels}	G11B20/14	G11B20/14		84
G11B20/16	9	using non self-clocking codes, i.e. the clock signals are either recorded in a separate clocking track or in a combination of several information tracks	G11B20/16	G11B20/16		361
G11B20/18	9	Error detection or correction; Testing {, e.g. of drop-outs}	G11B20/18	G11B20/18		3081
G11B20/1803	10	{by redundancy in data representation}	G11B20/18	G11B20/18		352
G11B20/1806	10	{Pulse code modulation systems for audio signals (G11B20/1803 takes precedence)}	G11B20/18	G11B20/18		148
G11B20/1809	11	{by interleaving}	G11B20/18	G11B20/18		619
G11B20/1813	11	{by adding special bits or symbols to the coded information (G11B20/1809 takes precedence)}	G11B20/18	G11B20/18		231
G11B20/1816	10	{Testing}	G11B20/18	G11B20/18		1402
G11B20/182	11	{using test patterns}	G11B20/18	G11B20/18		392
G11B2020/1823	11	{wherein a flag is set when errors are detected or qualified}	G11B20/18	G11B20/18		180
G11B2020/1826	11	{wherein a defect list or error map is generated}	G11B20/18	G11B20/18		193
G11B2020/183	11	{wherein at least one additional attempt is made to read or write the data when a first attempt is unsuccessful}	G11B20/18	G11B20/18		528
G11B20/1833	10	{by adding special lists or symbols to the coded information (G11B20/1806, G11B20/1866 take precedence)}	G11B20/18	G11B20/18		2014
G11B2020/1836	11	{using a Reed Solomon [RS] code}	G11B20/18	G11B20/18		174
G11B2020/184	12	{using a cross-interleaved Reed Solomon [CIRC]}	G11B20/18	G11B20/18		45
G11B2020/1843	11	{using a cyclic redundancy check [CRC]}	G11B20/18	G11B20/18		128
G11B2020/1846	11	{using a picket code, i.e. a code in which a long distance code [LDC] is arranged as an array and columns containing burst indicator subcode [BIS] are multiplexed for erasure decoding}	G11B20/18	G11B20/18		31
G11B2020/185	11	{using an low density parity check [LDPC] code}	G11B20/18	G11B20/18		194
G11B2020/1853	11	{using a product code which has inner and outer parity symbols}	G11B20/18	G11B20/18		110
G11B2020/1856	11	{using a turbo code}	G11B20/18	G11B20/18		15
G11B2020/1859	11	{wherein a trellis is used for decoding the error correcting code}	G11B20/18	G11B20/18		32
G11B2020/1863	11	{wherein the Viterbi algorithm is used for decoding the error correcting code}	G11B20/18	G11B20/18		77
G11B20/1866	10	{by interleaving (G11B20/1809 takes precedence)}	G11B20/18	G11B20/18		375
G11B2020/1869	10	{Preventing ageing phenomena from causing data loss, e.g. by monitoring the age of record carriers or by recognising wear, and by copying information elsewhere when a record carrier becomes unreliable}	G11B20/18	G11B20/18		93
G11B2020/1873	10	{Temporary defect structures for write-once discs, e.g. TDDS, TDMA or TDFL}	G11B20/18	G11B20/18		216
G11B20/1876	10	{Interpolating methods}	G11B20/18	G11B20/18		236
G11B20/1879	10	{Direct read-after-write methods}	G11B20/18	G11B20/18		472
G11B20/1883	10	{Methods for assignment of alternate areas for defective areas}	G11B20/18	G11B20/18		1445
G11B20/1886	11	{with tapes}	G11B20/18	G11B20/18		24
G11B20/1889	11	{with discs}	G11B20/18	G11B20/18		327
G11B2020/1893	11	{using linear replacement to relocate data from a defective block to a non-contiguous spare area, e.g. with a secondary defect list [SDL]}	G11B20/18	G11B20/18		261
G11B2020/1896	11	{using skip or slip replacement to relocate data from a defective block to the next usable block, e.g. with a primary defect list [PDL]}	G11B20/18	G11B20/18		142
G11B20/20	8	for correction of skew for multitrack recording	G11B20/20	G11B20/20		282
G11B20/22	8	for reducing distortions	G11B20/22	G11B20/22		670
G11B20/225	9	{for reducing wow or flutter (by controlling the speed of the record carrier G11B15/46, G11B19/28)}	G11B20/22	G11B20/22		196
G11B20/24	8	for reducing noise {(control of amplification in general, e.g. dependent upon noise level H03G)}	G11B20/24	G11B20/24		1021
G11B21/00	7	Head arrangements not specific to the method of recording or reproducing	G11B21/00	G11B21/00		288
G11B21/003	8	{Disposition of fixed heads, e.g. for scanning, selecting or following of tracks}	G11B21/00	G11B21/00		45
G11B21/006	9	{for track following}	G11B21/00	G11B21/00		16
G11B21/02	8	Driving or moving of heads	G11B21/02	G11B21/02		1353
G11B21/022	9	{Programmed access in sequence to indexed parts of operating record carriers}	G11B21/02	G11B21/02		19
G11B21/025	10	{of rotating discs}	G11B21/02	G11B21/02		130
G11B21/027	10	{of tapes}	G11B21/02	G11B21/02		6
G11B21/03	9	for correcting time base error {during transducing operation, by driving or moving the head in a direction more or less parallel to the direction of travel of the recording medium, e.g. tangential direction on a rotating disc (by driving or moving the head in a direction which cuts across the direction of travel of the recording medium G11B15/1808, G11B15/467)}	G11B21/03	G11B21/03		87
G11B21/04	9	Automatic feed mechanism producing a {progressive} transducing traverse of the head in a direction which cuts across the direction of travel of the recording medium, e.g. helical scan {, e.g. by lead-screw (G11B19/20, G11B21/08 and G11B21/10 take precedence)}	G11B21/04	G11B21/04		198
G11B21/043	10	{for stationary discs}	G11B21/04	G11B21/04		53
G11B21/046	10	{details of the feed mechanism}	G11B21/04	G11B21/04		21
G11B21/06	10	the record carrier having {mechanical} means to ensure traverse movement of the head {, e.g. grooves}	G11B21/06	G11B21/06		45
G11B21/08	9	Track changing or selecting (G11B21/12 takes precedence){during transducing operation}	G11B21/08	G11B21/08		451
G11B21/081	10	{Access to indexed tracks or parts of continuous track}	G11B21/08	G11B21/08		151
G11B21/083	11	{on discs}	G11B21/08	G11B21/08		877
G11B21/085	12	{with track following of accessed part}	G11B21/08	G11B21/08		458
G11B21/086	11	{on tapes}	G11B21/08	G11B21/08		33
G11B21/088	12	{with track following of accessed part}	G11B21/08	G11B21/08		25
G11B21/10	9	Track finding or aligning by moving the head {; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following (characterised by the track access method G11B21/08)}	G11B21/10	G11B21/10		800
G11B21/103	10	{on tapes}	G11B21/10	G11B21/10		121
G11B21/106	10	{on disks}	G11B21/10	G11B21/10		548
G11B21/12	9	Raising and lowering; Back-spacing or forward-spacing along track; Returning to starting position {otherwise than during transducing operation}	G11B21/12	G11B21/12		784
G11B21/14	10	manually	G11B21/14	G11B21/14		2
G11B21/16	8	Supporting the heads; Supporting the sockets for plug-in heads	G11B21/16	G11B21/16		399
G11B21/18	9	while the head is moving	G11B21/18	G11B21/18		52
G11B21/20	9	while the head is in operative position but stationary or permitting minor movements to follow irregularities in surface of record carrier	G11B21/20	G11B21/20		147
G11B21/21	10	with provision for maintaining desired spacing of head from record carrier, e.g. fluid-dynamic spacing, slider	G11B21/21	G11B21/21		966
G11B21/22	9	while the head is out of operative position	G11B21/22	G11B21/22		675
G11B21/24	9	Head support adjustments	G11B21/24	G11B21/24		207
G11B21/26	9	Means for interchange or replacement of head or head element	G11B21/26	G11B21/26		36
G11B23/00	7	Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus {; Intermediate mediums; Apparatus or processes specially adapted for their manufacture (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B29, B41M, B05D, C08L, F16N)}<br><br><u>NOTE</u><br><br> In group G11B23/00, recording or reproducing apparatus does not include the record carriers. 	G11B23/00	G11B23/00		505
G11B23/0007	8	{Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information, (volume compression or expansion circuits per seH03G7/00)}<br><br><u>NOTE</u><br><br>This group is closed down and will in due course be transferred to G11B20/22 and G11B20/24 and subgroups. 	G11B23/00	G11B23/00		407
G11B23/0014	8	{record carriers not specifically of filamentary or web form (G11B23/0057 takes precedence)}	G11B23/00	G11B23/00		111
G11B23/0021	9	{discs}	G11B23/00	G11B23/00		463
G11B23/0028	10	{Details}	G11B23/00	G11B23/00		69
G11B23/0035	11	{means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving (means for driving the head G11B21/06; guiding the disc for centering or locking G11B17/022; turntables or spindles for driving G11B19/2009)}	G11B23/00	G11B23/00		570
G11B23/0042	12	{with provision for auxiliary features (sensing such features G11B17/00, G11B19/02)}	G11B23/00	G11B23/00		179
G11B23/005	10	{flexible discs (G11B23/0035 takes precedence)}	G11B23/00	G11B23/00		33
G11B23/0057	8	{Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure (for record carriers with directly readable mechanical information G11B3/685); record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture}	G11B23/00	G11B23/00		384
G11B23/0064	9	{mediums or carriers characterised by the selection of the material}	G11B23/00	G11B23/00		23
G11B23/0071	10	{additional layers for lubrication or wear protection (lubricating means not integrated in the record carrier structure G11B23/50)}	G11B23/00	G11B23/00		17
G11B23/0078	10	{information structure layers using metallic or dielectric coatings}	G11B23/00	G11B23/00		9
G11B23/0085	10	{intermediate mediums using a photosensitive material, e.g. photo-resist}	G11B23/00	G11B23/00		18
G11B23/0092	10	{molding resin compositions}	G11B23/00	G11B23/00		11
G11B23/02	8	Containers; Storing means {both adapted to cooperate with the recording or reproducing means}	G11B23/02	G11B23/02		507
G11B23/021	9	{comprising means for reducing influence of physical parameters, e.g. temperature change, moisture (combined with means for reconditioning or cleaning G11B23/507)}	G11B23/02	G11B23/02		199
G11B23/023	9	Containers for magazines or cassettes	G11B23/023	G11B23/023		443
G11B23/0233	10	{Containers for a single cassette}	G11B23/023	G11B23/023		742
G11B23/0236	10	{Containers for several cassettes}	G11B23/023	G11B23/023		814
G11B23/027	9	Containers for single reels or spools	G11B23/027	G11B23/027		315
G11B23/03	9	Containers for flat record carriers	G11B23/03	G11B23/03		557
G11B23/0301	10	{Details}	G11B23/03	G11B23/03		46
G11B23/0302	11	{Auxiliary features}	G11B23/03	G11B23/03		162
G11B23/0303	12	{Write protect features with a sliding part}	G11B23/03	G11B23/03		93
G11B23/0305	12	{Semiconductor memories}	G11B23/03	G11B23/03		97
G11B23/0306	11	{Means for locking the record carriers}	G11B23/03	G11B23/03		93
G11B23/0307	11	{Positioning or centering features}	G11B23/03	G11B23/03		130
G11B23/0308	11	{Shutters (G11B23/0317 takes precedence)}	G11B23/03	G11B23/03		682
G11B23/031	11	{Indicating means, e.g. sticker, bar code}	G11B23/03	G11B23/03		125
G11B23/0311	11	{Wrong insertion preventing means}	G11B23/03	G11B23/03		81
G11B23/0312	11	{Driving features}	G11B23/03	G11B23/03		96
G11B23/0313	11	{Container cases}	G11B23/03	G11B23/03		132
G11B23/0315	12	{Materials}	G11B23/03	G11B23/03		57
G11B23/0316	12	{Constructional details, e.g. shape}	G11B23/03	G11B23/03		462
G11B23/0317	11	{Containers with interchangeable record carriers}	G11B23/03	G11B23/03		245
G11B23/0318	11	{Containers with incorporated transducing heads}	G11B23/03	G11B23/03		31
G11B23/032	10	{for rigid discs}	G11B23/03	G11B23/03		99
G11B23/0321	11	{rigid cartridges for single discs}	G11B23/03	G11B23/03		166
G11B23/0322	12	{comprising latching or movable handling devices (G11B17/032 takes precedence)}	G11B23/03	G11B23/03		24
G11B23/0323	11	{for disc-packs}	G11B23/03	G11B23/03		169
G11B23/0325	12	{comprising latching or movable handling devices (G11B17/038 takes precedence)}	G11B23/03	G11B23/03		34
G11B23/0326	10	{Assembling of containers}	G11B23/03	G11B23/03		104
G11B23/0327	10	{for special applications not otherwise provided for}	G11B23/03	G11B23/03		141
G11B23/0328	10	{the disc having to be extracted from the cartridge for recording reproducing, e.g. cooperating with an extractable tray}	G11B23/03	G11B23/03		180
G11B23/033	10	for flexible discs	G11B23/033	G11B23/033		102
G11B23/0332	11	{for single discs, e.g. envelopes}	G11B23/033	G11B23/033		353
G11B23/0335	11	{for disc packs}	G11B23/033	G11B23/033		22
G11B23/0337	12	{comprising latching or movable handling devices (G11B23/0325 and G11B17/038 take precedence)}	G11B23/033	G11B23/033		
G11B23/037	9	Single reels or spools	G11B23/037	G11B23/037		652
G11B23/04	9	Magazines; Cassettes {for webs or filaments}(G11B23/12 takes precedence {; cassettes with sealing or locking means G11B23/28; dummy cassettes for locking in the drive G11B33/005})	G11B23/04	G11B23/04		558
G11B23/041	10	{Details}	G11B23/04	G11B23/04		47
G11B23/042	11	{Auxiliary features (sensing such features G11B15/06)}	G11B23/04	G11B23/04		313
G11B23/043	11	{Brakes for tapes or tape reels}	G11B23/04	G11B23/04		153
G11B23/044	11	{Reels or cores; positioning of the reels in the cassette}	G11B23/04	G11B23/04		246
G11B23/045	11	{Covers}	G11B23/04	G11B23/04		131
G11B23/046	11	{Indicating means, e.g. quantity of tape}	G11B23/04	G11B23/04		80
G11B23/047	11	{Guiding means}	G11B23/04	G11B23/04		87
G11B23/048	11	{Driving features}	G11B23/04	G11B23/04		36
G11B23/049	10	{Cassettes for special applications not otherwise provided for}	G11B23/04	G11B23/04		413
G11B23/06	10	for housing endless webs or filaments	G11B23/06	G11B23/06		307
G11B23/07	11	using a single reel or core	G11B23/07	G11B23/07		112
G11B23/08	10	for housing webs or filaments having two distinct ends	G11B23/08	G11B23/08		179
G11B23/087	11	using two different reels or cores	G11B23/087	G11B23/087		868
G11B23/08707	12	{Details}	G11B23/087	G11B23/087		92
G11B23/08714	13	{Auxiliary features (sensing such features G11B15/06)}	G11B23/087	G11B23/087		465
G11B23/08721	13	{Brakes for tapes or tape reels}	G11B23/087	G11B23/087		389
G11B23/08728	13	{Reels or cores; positioning of the reels in the cassette}	G11B23/087	G11B23/087		387
G11B23/08735	13	{Covers}	G11B23/087	G11B23/087		404
G11B23/08742	14	{in combination with brake means}	G11B23/087	G11B23/087		75
G11B23/0875	13	{Indicating means, e.g. quantity of tape}	G11B23/087	G11B23/087		206
G11B23/08757	13	{Guiding means}	G11B23/087	G11B23/087		414
G11B23/08764	14	{Liner sheets}	G11B23/087	G11B23/087		129
G11B23/08771	14	{Pressure pads}	G11B23/087	G11B23/087		76
G11B23/08778	13	{Driving features, e.g. belt}	G11B23/087	G11B23/087		228
G11B23/08785	13	{Envelopes}	G11B23/087	G11B23/087		316
G11B23/08792	13	{Shielding devices}	G11B23/087	G11B23/087		23
G11B23/093	12	the reels or cores being coaxial	G11B23/093	G11B23/093		83
G11B23/107	11	using one reel or core, one end of the record carrier coming out of the magazine or cassette	G11B23/107	G11B23/107		897
G11B23/113	9	Apparatus or processes specially adapted for the manufacture of magazines or cassettes {, e.g. initial loading into container (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B21, B29, B65)}	G11B23/113	G11B23/113		530
G11B23/12	9	Bins for random storage of webs or filaments	G11B23/12	G11B23/12		108
G11B23/14	8	providing ability to repeat location, e.g. using sprocket holes	G11B23/14	G11B23/14		9
G11B23/16	8	Record carriers with single-track for recording at spaced intervals along the track thereof, e.g. for speech or language training {contains no documents}	G11B23/16	G11B23/16		24
G11B23/18	8	Record carriers with multiple tracks, e.g. with complementary and partial tracks such as paired "stereo" tracks {contains no documents}	G11B23/18	G11B23/18		23
G11B23/20	8	with provision for splicing to provide permanent or temporary connections	G11B23/20	G11B23/20		120
G11B23/22	9	of endless belts; of tapes forming Moebius loops	G11B23/22	G11B23/22		40
G11B23/24	9	of tapes having multiple tracks parallel to edge of record carrier by offset splicing to form endless loop with one or more helical tracks	G11B23/24	G11B23/24		5
G11B23/26	9	of leaders for loading or threading, e.g. to form a temporary connection	G11B23/26	G11B23/26		219
G11B23/28	8	Indicating {or preventing} prior or unauthorised use, {e.g. cassettes with sealing or locking means, write-protect devices for discs (write-protect devices for tapes G11B23/042, G11B23/08714; dummy cassettes for locking in the drive G11B33/005)}	G11B23/28	G11B23/28		246
G11B23/281	9	{by changing the physical properties of the record carrier}	G11B23/28	G11B23/28		191
G11B23/282	10	{Limited play}	G11B23/28	G11B23/28		127
G11B23/283	9	{Security features, e.g. digital codes}	G11B23/28	G11B23/28		66
G11B23/284	10	{on the record carrier}	G11B23/28	G11B23/28		247
G11B23/285	10	{on the container or cartridge}	G11B23/28	G11B23/28		41
G11B23/286	9	{Antitheft arrangements, e.g. Electronic Article Surveillance [EAS] tags}	G11B23/28	G11B23/28		92
G11B23/287	9	{by mechanical lock}	G11B23/28	G11B23/28		95
G11B23/288	9	{Protecting disks from being written or overwritten}	G11B23/28	G11B23/28		115
G11B23/30	8	with provision for auxiliary signals	G11B23/30	G11B23/30		360
G11B23/32	9	Electrical or mechanical contacting means; Tape stop foils	G11B23/32	G11B23/32		26
G11B23/34	9	Signal means additional to the main recording track, e.g. photoelectric sensing of sprocket holes for timing	G11B23/34	G11B23/34		75
G11B23/36	9	Signals on record carriers or on containers and recorded by the same method as the main recording	G11B23/36	G11B23/36		230
G11B23/38	8	Visual features other than those contained in record tracks or represented by sprocket holes {the visual signals being auxiliary signals}	G11B23/38	G11B23/38		206
G11B23/40	9	Identifying or analogous means applied to or incorporated in the record carrier and not intended for visual display simultaneously with the playing-back of the record carrier, e.g. label, leader, photograph	G11B23/40	G11B23/40		1211
G11B23/42	9	Marks for indexing, speed-controlling, synchronising, or timing	G11B23/42	G11B23/42		158
G11B23/44	9	Information for display simultaneously with playback of the record, e.g. photographic matter (associated working of cameras or projectors with sound recording or reproducing means G03B31/00)	G11B23/44	G11B23/44		142
G11B23/50	8	Reconditioning of record carriers; Cleaning of record carriers {; Carrying-off electrostatic charges}(G11B3/58 takes precedence)	G11B23/50	G11B23/50		260
G11B23/502	9	{of tape carriers}	G11B23/50	G11B23/50		314
G11B23/505	9	{of disk carriers}	G11B23/50	G11B23/50		904
G11B23/507	10	{combined with means for reducing influence of physical parameters, e.g. temperature change, moisture}	G11B23/50	G11B23/50		154
G11B25/00	7	Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing {, e.g. dictating apparatus; Combinations of such apparatus}	G11B25/00	G11B25/00		104
G11B25/02	8	using cylindrical record carriers	G11B25/02	G11B25/02		502
G11B25/04	8	using flat record carriers, e.g. disc, card	G11B25/04	G11B25/04		1183
G11B25/043	9	{using rotating discs}	G11B25/04	G11B25/04		2881
G11B25/046	9	{using stationary discs, or cards provided with a circular recording area (driving heads relatively to stationary record carriers for mechanical transducing G11B3/40; automatic feed mechanism producing a transducing traverse of the head across stationary disk tracks G11B21/043)}	G11B25/04	G11B25/04		113
G11B25/06	8	using web-form record carriers, e.g. tape	G11B25/06	G11B25/06		578
G11B25/063	9	{using tape inside container}	G11B25/06	G11B25/06		686
G11B25/066	9	{adapted for use with containers of different sizes or configurations; adaptor devices therefor}	G11B25/06	G11B25/06		427
G11B25/08	8	using filamentary record carriers, e.g. wire	G11B25/08	G11B25/08		97
G11B25/10	8	Apparatus capable of using record carriers defined in more than one of the sub-groups G11B25/02&#160;-&#160;G11B25/08; {Adaptor devices therefor}	G11B25/10	G11B25/10		401
G11B27/00	7	Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel	G11B27/00	G11B27/00		699
G11B27/002	8	{Programmed access in sequence to a plurality of record carriers or indexed parts, e.g. tracks, thereof, e.g. for editing; (transfer of record carriers from magazine G11B15/68, G11B17/10; G11B17/22)}	G11B27/00	G11B27/00		1931
G11B27/005	8	{Reproducing at a different information rate from the information rate of recording (for television signals H04N5/783)}	G11B27/00	G11B27/00		1916
G11B27/007	9	{reproducing continuously a part of the information, i.e. repeating}	G11B27/00	G11B27/00		538
G11B27/02	8	Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers	G11B27/02	G11B27/02		1053
G11B27/022	9	Electronic editing of analogue information signals, e.g. audio or video signals	G11B27/022	G11B27/022		179
G11B27/024	10	on tapes (G11B27/028, G11B27/029 take precedence)	G11B27/024	G11B27/024		1285
G11B27/026	10	on discs (G11B27/028, G11B27/029 take precedence)	G11B27/026	G11B27/026		173
G11B27/028	10	with computer assistance	G11B27/028	G11B27/028		754
G11B27/029	10	Insert-editing	G11B27/029	G11B27/029		455
G11B27/031	9	Electronic editing of digitised analogue information signals, e.g. audio or video signals	G11B27/031	G11B27/031		5049
G11B27/032	10	on tapes (G11B27/036, G11B27/038 take precedence)	G11B27/032	G11B27/032		1283
G11B27/034	10	on discs (G11B27/036, G11B27/038 take precedence)	G11B27/034	G11B27/034		8267
G11B27/036	10	Insert-editing	G11B27/036	G11B27/036		1978
G11B27/038	10	Cross-faders therefor	G11B27/038	G11B27/038		279
G11B27/04	9	using differential drive of record carrier and head {(transferred to G11B15/1875)}	G11B27/04	G11B27/04		5
G11B27/06	9	Cutting and rejoining; Notching, or perforating record carriers otherwise than by recording styli (record carriers with provision for splicing G11B23/20)	G11B27/06	G11B27/06		230
G11B27/10	8	Indexing; Addressing; Timing or synchronising; Measuring tape travel	G11B27/10	G11B27/10		4542
G11B27/102	9	{Programmed access in sequence to addressed parts of tracks of operating record carriers (access by moving the head G11B3/08, G11B5/54, G11B7/085, G11B21/022; by moving the record carrier G11B15/005, G11B17/005, by driving of both record carrier and head G11B15/1816)}	G11B27/10	G11B27/10		1043
G11B27/105	10	{of operating discs}	G11B27/10	G11B27/10		8221
G11B27/107	10	{of operating tapes}	G11B27/10	G11B27/10		1528
G11B27/11	9	by using information not detectable on the record carrier	G11B27/11	G11B27/11		3570
G11B27/13	10	the information being derived from movement of the record carrier, e.g. using tachometer	G11B27/13	G11B27/13		503
G11B27/15	11	using mechanical sensing means	G11B27/15	G11B27/15		13
G11B27/17	11	using electrical sensing means	G11B27/17	G11B27/17		196
G11B27/19	9	by using information detectable on the record carrier	G11B27/19	G11B27/19		965
G11B27/22	10	Means responsive to presence or absence of recorded information signals	G11B27/22	G11B27/22		611
G11B27/24	10	by sensing features on the record carrier other than the transducing track {; sensing signals or marks recorded by another method than the main recording}	G11B27/24	G11B27/24		1007
G11B27/26	11	by photoelectric detection, e.g. of sprocket holes	G11B27/26	G11B27/26		100
G11B27/28	10	by using information signals recorded by the same method as the main recording {(G11B27/22 takes precedence)}	G11B27/28	G11B27/28		3517
G11B27/30	11	on the same track as the main recording	G11B27/30	G11B27/30		439
G11B27/3009	12	{used signal is a pilot signal inside the frequency band of the recorded main information signal}	G11B27/30	G11B27/30		79
G11B27/3018	12	{used signal is a pilot signal outside the frequency band of the recorded main information signal}	G11B27/30	G11B27/30		144
G11B27/3027	12	{used signal is digitally coded}	G11B27/30	G11B27/30		3572
G11B27/3036	13	{Time code signal}	G11B27/30	G11B27/30		468
G11B27/3045	14	{superimposed on the recorded main signal, e.g. burn-in-time code}	G11B27/30	G11B27/30		67
G11B27/3054	14	{Vertical Interval Time code [VITC]}	G11B27/30	G11B27/30		282
G11B27/3063	13	{Subcodes}	G11B27/30	G11B27/30		767
G11B27/3072	13	{Coded signal uses a correlation function for detection}	G11B27/30	G11B27/30		6
G11B27/3081	12	{used signal is a video-frame or a video-field (P.I.P)}	G11B27/30	G11B27/30		208
G11B27/309	12	{Table of contents}	G11B27/30	G11B27/30		288
G11B27/32	11	on separate auxiliary tracks of the same or an auxiliary record carrier	G11B27/32	G11B27/32		802
G11B27/321	12	{used signal consists of two 180-degr. phase shifted signals of the same frequency}	G11B27/32	G11B27/32		10
G11B27/322	12	{used signal is digitally coded}	G11B27/32	G11B27/32		1291
G11B27/323	13	{Time code signal, e.g. on a cue track as SMPTE- or EBU-time code}	G11B27/32	G11B27/32		352
G11B27/324	13	{Duty cycle modulation of control pulses, e.g. VHS-CTL-coding systems, RAPID-time code, VASS- or VISS-cue signals}	G11B27/32	G11B27/32		259
G11B27/325	13	{Subcodes}	G11B27/32	G11B27/32		16
G11B27/326	12	{used signal is a video-frame or a video-field (P.I.P.)}	G11B27/32	G11B27/32		264
G11B27/327	12	{Table of contents}	G11B27/32	G11B27/32		193
G11B27/328	13	{on a tape [TTOC]}	G11B27/32	G11B27/32		415
G11B27/329	13	{on a disc [VTOC]}	G11B27/32	G11B27/32		3732
G11B27/34	9	Indicating arrangements&#160; {(indicating means incorporated in magazine or cassette&#160;G11B23/046&#160;and&#160;G11B23/0875; indicating measured values in general&#160;G01D)}	G11B27/34	G11B27/34		9528
G11B27/36	8	Monitoring, i.e. supervising the progress of recording or reproducing {(for digital recording G11B20/00 and s.gr.; for monitoring, testing or measuring of TV recorders of the type covered by H04N5/76 and subgroups, seeH04N17/06)}	G11B27/36	G11B27/36		4498
G11B31/00	7	Arrangements for the associated working of recording or reproducing apparatus with related apparatus (with cameras or projectors G03B31/00{; recording/reproducing of music for electrophonic musical instruments G10H1/0033; automatic arrangements for answering calls or for recording messages for absent subscribers H04M1/64; telephonic communication systems adapted for combination with dictation recording and playback systems H04M11/10; connection of TV recorder with other related apparatus, e.g. TV camera or receiver, in which the TV signal is significantly involved H04N, e.g. H04N23/00, H04N5/765; combination of radio or TV with other apparatus, e.g. with vehicles H05K11/00})	G11B31/00	G11B31/00		2141
G11B31/003	8	{with radio receiver}	G11B31/00	G11B31/00		625
G11B31/006	8	{with video camera or receiver}	G11B31/00	G11B31/00		1089
G11B31/02	8	with automatic musical instruments	G11B31/02	G11B31/02		823
G11B33/00	7	Constructional parts, details or accessories not provided for in the other groups of this subclass	G11B33/00	G11B33/00		220
G11B33/005	8	{Means for locking the disc or cassette receiving slot, e.g. dummy cassettes locked in the slot}	G11B33/00	G11B33/00		197
G11B33/02	8	Cabinets; Cases; Stands; Disposition of apparatus therein or thereon	G11B33/02	G11B33/02		2238
G11B33/022	9	{Cases}	G11B33/02	G11B33/02		1286
G11B33/025	10	{Portable cases}	G11B33/02	G11B33/02		852
G11B33/027	9	{Covers (G11B33/022 takes precedence; with means for guiding the record carrier G11B17/34)}	G11B33/02	G11B33/02		1445
G11B33/04	9	modified to store record carriers {(containers, storing means adapted for cooperation with the recording or reproducing apparatus G11B23/02)}	G11B33/04	G11B33/04		814
G11B33/0405	10	{for storing discs (anti-theft cases with locking means E05B73/0023)}	G11B33/04	G11B33/04		396
G11B33/0411	11	{Single disc boxes (G11B33/0461 takes precedence)}	G11B33/04	G11B33/04		257
G11B33/0416	12	{for disc cartridges}	G11B33/04	G11B33/04		295
G11B33/0422	12	{for discs without cartridge}	G11B33/04	G11B33/04		1277
G11B33/0427	13	{comprising centre hole locking means}	G11B33/04	G11B33/04		1169
G11B33/0433	11	{Multiple disc containers (G11B33/0461 takes precedence)}	G11B33/04	G11B33/04		496
G11B33/0438	12	{for disc cartridges}	G11B33/04	G11B33/04		365
G11B33/0444	12	{for discs without cartridge}	G11B33/04	G11B33/04		812
G11B33/045	13	{comprising centre hole locking means}	G11B33/04	G11B33/04		476
G11B33/0455	12	{for single disc boxes}	G11B33/04	G11B33/04		265
G11B33/0461	11	{Disc storage racks}	G11B33/04	G11B33/04		286
G11B33/0466	12	{for disc cartridges}	G11B33/04	G11B33/04		219
G11B33/0472	12	{for discs without cartridge}	G11B33/04	G11B33/04		243
G11B33/0477	13	{comprising centre hole locking means}	G11B33/04	G11B33/04		81
G11B33/0483	12	{for single disc boxes}	G11B33/04	G11B33/04		516
G11B33/0488	11	{in boxes or containers comprising additional sound reproducing or activating means}	G11B33/04	G11B33/04		124
G11B33/0494	11	{packages made by folding}	G11B33/04	G11B33/04		750
G11B33/06	9	combined with other apparatus having a different main function	G11B33/06	G11B33/06		1563
G11B33/08	9	Insulation or absorption of undesired vibrations or sounds	G11B33/08	G11B33/08		3375
G11B33/10	8	Indicating arrangements; Warning arrangements {(G11B15/04, G11B19/04, G11B27/34, G11B27/36 take precedence)}	G11B33/10	G11B33/10		2427
G11B33/12	8	Disposition of constructional parts in the apparatus, e.g. of power supply, of modules	G11B33/12	G11B33/12		1331
G11B33/121	9	{the apparatus comprising a single recording/reproducing device}	G11B33/12	G11B33/12		1215
G11B33/122	10	{Arrangements for providing electrical connections, e.g. connectors, cables, switches}	G11B33/12	G11B33/12		2033
G11B33/123	10	{Mounting arrangements of constructional parts onto a chassis}	G11B33/12	G11B33/12		825
G11B33/124	11	{of the single recording/reproducing device, e.g. disk drive, onto a chassis}	G11B33/12	G11B33/12		1549
G11B33/125	9	{the apparatus comprising a plurality of recording/reproducing devices, e.g. modular arrangements, arrays of disc drives}	G11B33/12	G11B33/12		473
G11B33/126	10	{Arrangements for providing electrical connections, e.g. connectors, cables, switches}	G11B33/12	G11B33/12		588
G11B33/127	10	{Mounting arrangements of constructional parts onto a chassis}	G11B33/12	G11B33/12		144
G11B33/128	11	{of the plurality of recording/reproducing devices, e.g. disk drives, onto a chassis}	G11B33/12	G11B33/12		1174
G11B33/14	8	Reducing influence of physical parameters, e.g. temperature change, moisture, dust	G11B33/14	G11B33/14		989
G11B33/1406	9	{Reducing the influence of the temperature}	G11B33/14	G11B33/14		534
G11B33/1413	10	{by fluid cooling}	G11B33/14	G11B33/14		169
G11B33/142	11	{by air cooling}	G11B33/14	G11B33/14		890
G11B33/1426	10	{by cooling plates, e.g. fins}	G11B33/14	G11B33/14		323
G11B33/1433	10	{by reducing the effects of the thermal expansion}	G11B33/14	G11B33/14		65
G11B33/144	10	{by detection, control, regulation of the temperature}	G11B33/14	G11B33/14		440
G11B33/1446	9	{Reducing contamination, e.g. by dust, debris}	G11B33/14	G11B33/14		1118
G11B33/1453	10	{by moisture}	G11B33/14	G11B33/14		225
G11B33/146	10	{constructional details of filters}	G11B33/14	G11B33/14		206
G11B33/1466	10	{sealing gaskets, (gasket in general F16J)}	G11B33/14	G11B33/14		283
G11B33/1473	10	{of/from bearings}	G11B33/14	G11B33/14		151
G11B33/148	9	{Reducing friction, adhesion, drag}	G11B33/14	G11B33/14		422
G11B33/1486	9	{Control/regulation of the pressure, e.g. the pressure inside the housing of a drive}	G11B33/14	G11B33/14		216
G11B33/1493	9	{Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges}	G11B33/14	G11B33/14		593
G11B2209/00	7	Recording or reproducing using a method not covered elsewhere in this subclass	CPCONLY	G11B2209/00		2
G11B2209/02	8	transducing on or investigating record carriers or information recording transducers or systems by using near-field interactions	CPCONLY	G11B2209/02		10
G11B2220/00	7	Record carriers by type	CPCONLY	G11B2220/00		1
G11B2220/17	8	Card-like record carriers	CPCONLY	G11B2220/17		177
G11B2220/20	8	Disc-shaped record carriers	CPCONLY	G11B2220/20		5109
G11B2220/21	9	characterised in that the disc is of read-only, rewritable, or recordable type	CPCONLY	G11B2220/21		35
G11B2220/211	10	Discs having both read-only and rewritable or recordable areas containing application data; Partial ROM media	CPCONLY	G11B2220/211		251
G11B2220/213	10	Read-only discs	CPCONLY	G11B2220/213		1082
G11B2220/215	10	Recordable discs	CPCONLY	G11B2220/215		265
G11B2220/216	11	Rewritable discs	CPCONLY	G11B2220/216		1910
G11B2220/218	11	Write-once discs	CPCONLY	G11B2220/218		1583
G11B2220/23	9	characterised in that the disc has a specific layer structure	CPCONLY	G11B2220/23		24
G11B2220/232	10	Double-sided discs, i.e. two recording layers accessed from opposite sides	CPCONLY	G11B2220/232		48
G11B2220/235	10	Multilayer discs, i.e. multiple recording layers accessed from the same side	CPCONLY	G11B2220/235		402
G11B2220/237	11	having exactly two recording layers	CPCONLY	G11B2220/237		192
G11B2220/25	9	characterised in that the disc is based on a specific recording technology	CPCONLY	G11B2220/25		18
G11B2220/2504	10	Holographic discs; Holographic digital data storage [HDDS]	CPCONLY	G11B2220/2504		245
G11B2220/2508	10	Magnetic discs	CPCONLY	G11B2220/2508		291
G11B2220/2512	11	Floppy disks	CPCONLY	G11B2220/2512		432
G11B2220/2516	11	Hard disks	CPCONLY	G11B2220/2516		3250
G11B2220/252	11	Patterned or quantised magnetic media, i.e. bits are stored in predefined single domain elements	CPCONLY	G11B2220/252		50
G11B2220/2525	10	Magneto-optical [MO] discs	CPCONLY	G11B2220/2525		915
G11B2220/2529	11	Mini-discs	CPCONLY	G11B2220/2529		575
G11B2220/2533	11	MO disc using magnetic super resolution, i.e., the magnetic mark is smaller than the laser spot size	CPCONLY	G11B2220/2533		1
G11B2220/2537	10	Optical discs	CPCONLY	G11B2220/2537		4403
G11B2220/2541	11	Blu-ray discs; Blue laser DVR discs	CPCONLY	G11B2220/2541		1748
G11B2220/2545	11	CDs	CPCONLY	G11B2220/2545		5261
G11B2220/255	12	CD-I, i.e. CD-interactive	CPCONLY	G11B2220/255		105
G11B2220/2554	12	CD-V [CD-Video], CDV, or CD+V, as defined in IEC 61104	CPCONLY	G11B2220/2554		34
G11B2220/2558	12	CD-XA format, i.e. eXtended architecture extension of the CD-ROM standard	CPCONLY	G11B2220/2558		15
G11B2220/2562	11	DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs	CPCONLY	G11B2220/2562		5403
G11B2220/2566	12	DVDs belonging to the minus family, i.e. -R, -RW, -VR	CPCONLY	G11B2220/2566		111
G11B2220/257	12	DVDs belonging to the plus family, i.e. +R, +RW, +VR	CPCONLY	G11B2220/257		94
G11B2220/2575	12	DVD-RAMs	CPCONLY	G11B2220/2575		765
G11B2220/2579	11	HD-DVDs [high definition DVDs]; AODs [advanced optical discs]	CPCONLY	G11B2220/2579		366
G11B2220/2583	11	wherein two standards are used on a single disc, e.g. one DVD section and one CD section	CPCONLY	G11B2220/2583		163
G11B2220/2587	11	Laser Discs; Optical disc using analog recording	CPCONLY	G11B2220/2587		260
G11B2220/2591	11	SFFO discs, i.e. small form factor optical discs; Portable blue	CPCONLY	G11B2220/2591		16
G11B2220/2595	11	Super-resolution optical discs, i.e. optical discs wherein the size of marks is below the optical diffraction limit	CPCONLY	G11B2220/2595		24
G11B2220/40	8	Combinations of multiple record carriers	CPCONLY	G11B2220/40		200
G11B2220/41	9	Flat as opposed to hierarchical combination, e.g. library of tapes or discs, CD changer, or groups of record carriers that together store one title	CPCONLY	G11B2220/41		1065
G11B2220/412	10	Distributed storage methods, i.e. the system may autonomously determine for a storage device that provides enough storage capacity for recording	CPCONLY	G11B2220/412		54
G11B2220/415	10	Redundant array of inexpensive disks [RAID] systems	CPCONLY	G11B2220/415		278
G11B2220/417	10	Redundant array of inexpensive tapes [RAIT] systems	CPCONLY	G11B2220/417		9
G11B2220/45	9	Hierarchical combination of record carriers, e.g. HDD for fast access, optical discs for long term storage or tapes for backup	CPCONLY	G11B2220/45		50
G11B2220/455	10	said record carriers being in one device and being used as primary and secondary/backup media, e.g. HDD-DVD combo device, or as source and target media, e.g. PC and portable player	CPCONLY	G11B2220/455		439
G11B2220/60	8	Solid state media	CPCONLY	G11B2220/60		202
G11B2220/61	9	wherein solid state memory is used for storing A/V content	CPCONLY	G11B2220/61		667
G11B2220/63	9	wherein solid state memory is used as a supplementary storage medium to store auxiliary data for detecting or correcting errors on a main storage medium	CPCONLY	G11B2220/63		28
G11B2220/65	9	wherein solid state memory is used for storing indexing information or metadata	CPCONLY	G11B2220/65		1201
G11B2220/652	10	said memory being attached to the recording medium	CPCONLY	G11B2220/652		20
G11B2220/655	11	Memory in cassette [MIC]	CPCONLY	G11B2220/655		280
G11B2220/657	11	Memory in disc [MID]	CPCONLY	G11B2220/657		82
G11B2220/80	8	Indexing information stored in optical or magnetic or other strip attached to cassette or disc, e.g. barcodes attached to a recording medium	CPCONLY	G11B2220/80		73
G11B2220/90	8	Tape-like record carriers	CPCONLY	G11B2220/90		8003
G11B2220/91	9	Helical scan format, wherein tracks are slightly tilted with respect to tape direction, e.g. VHS, DAT, DVC, AIT or exabyte	CPCONLY	G11B2220/91		262
G11B2220/913	10	Digital audio tape [DAT] format	CPCONLY	G11B2220/913		496
G11B2220/916	10	Digital data storage [DDS] format	CPCONLY	G11B2220/916		25
G11B2220/93	9	Longitudinal format, wherein tracks are in the direction of the tape, read with a static head, e.g. DCC	CPCONLY	G11B2220/93		103
G11B2220/95	9	Serpentine format, wherein a single track or group of tracks traverses the tape plural times from one end to the other	CPCONLY	G11B2220/95		59
G11B2220/953	10	Digital linear tape [DLT] format	CPCONLY	G11B2220/953		1
G11B2220/956	10	Linear tape open [LTO] format	CPCONLY	G11B2220/956		44
