WO2001043122A3 - Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same - Google Patents
Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same Download PDFInfo
- Publication number
- WO2001043122A3 WO2001043122A3 PCT/US2000/042493 US0042493W WO0143122A3 WO 2001043122 A3 WO2001043122 A3 WO 2001043122A3 US 0042493 W US0042493 W US 0042493W WO 0143122 A3 WO0143122 A3 WO 0143122A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- servo
- magnetic
- making
- same
- pattern
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed 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
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed 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 for track following on disks
- G11B5/59633—Servo formatting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
- G11B21/02—Driving or moving of heads
- G11B21/022—Programmed access in sequence to indexed parts of operating record carriers
- G11B21/025—Programmed access in sequence to indexed parts of operating record carriers of rotating discs
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed 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
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed 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 for track following on disks
- G11B5/59633—Servo formatting
- G11B5/59655—Sector, sample or burst servo format
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/743—Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
Abstract
A magnetic medium comprises a magnetic disc (106) having a read surface (228) that has a plurality of tracks (200), at least some having servo sectors (204). The servo sectors comprise a plurality of magnetic irregularities, such as pits (226) or regions (306) of reduced magnetic coercivity, arranged in a servo pattern along the servo sector at a servo frequency. A magnetic pattern is recorded in the disc along the servo sector (204) at a high carrier frequency. A process for manufacturing the servo pattern and for recovering servo data from the servo pattern are also described.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/726,786 US6510015B2 (en) | 1999-12-10 | 2000-11-30 | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17023999P | 1999-12-10 | 1999-12-10 | |
US60/170,239 | 1999-12-10 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/726,786 Continuation US6510015B2 (en) | 1999-12-10 | 2000-11-30 | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2001043122A2 WO2001043122A2 (en) | 2001-06-14 |
WO2001043122A3 true WO2001043122A3 (en) | 2002-02-21 |
WO2001043122B1 WO2001043122B1 (en) | 2002-06-20 |
Family
ID=22619122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/042493 WO2001043122A2 (en) | 1999-12-10 | 2000-11-30 | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same |
Country Status (2)
Country | Link |
---|---|
US (1) | US6510015B2 (en) |
WO (1) | WO2001043122A2 (en) |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6751035B1 (en) * | 1999-06-08 | 2004-06-15 | Seagate Technology Llc | Method and system for initializing patterned media |
US6864042B1 (en) * | 2000-07-25 | 2005-03-08 | Seagate Technology Llc | Patterning longitudinal magnetic recording media with ion implantation |
US6600312B1 (en) * | 2001-01-13 | 2003-07-29 | International Business Machines Corporation | Method and apparatus for indexing hard disks by using a scanning probe |
US7019924B2 (en) | 2001-02-16 | 2006-03-28 | Komag, Incorporated | Patterned medium and recording head |
JP2003242714A (en) * | 2001-10-24 | 2003-08-29 | Fuji Electric Co Ltd | Information recording medium, manufacturing method therefor, information processor and copyright management system |
US6656333B2 (en) | 2002-01-09 | 2003-12-02 | Seagate Technology Llc | Process for making patterned magnetic recording media employing a nonfunctional lubricant |
US20050036223A1 (en) * | 2002-11-27 | 2005-02-17 | Wachenschwanz David E. | Magnetic discrete track recording disk |
US7147790B2 (en) * | 2002-11-27 | 2006-12-12 | Komag, Inc. | Perpendicular magnetic discrete track recording disk |
JP4040514B2 (en) | 2003-03-26 | 2008-01-30 | Tdk株式会社 | Magnetic recording medium and method for manufacturing magnetic recording medium |
US6906886B2 (en) * | 2003-09-08 | 2005-06-14 | Seagate Technology Llc | Peak to peak detect method to protect seek/settle induced encroachment |
US7151645B2 (en) * | 2003-09-23 | 2006-12-19 | Seagate Technology Llc | Interleaved repeatable runout estimation |
US7394622B2 (en) * | 2004-12-07 | 2008-07-01 | Seagate Technology Llc | Magnetic recording media with discrete tracks of magnetic material in a magnetically soft underlayer |
US7064914B1 (en) | 2004-12-22 | 2006-06-20 | Seagate Technology Llc | Position error signal quality |
EP1844471A1 (en) * | 2005-01-24 | 2007-10-17 | Nxp B.V. | Magnetic rom information carrier with additional stabilizing layer |
US7161753B2 (en) * | 2005-01-28 | 2007-01-09 | Komag, Inc. | Modulation of sidewalls of servo sectors of a magnetic disk and the resultant disk |
CN1828730B (en) * | 2005-02-28 | 2010-10-13 | Tdk股份有限公司 | Magnetic recording medium, recording/reproducing apparatus, and stamper |
JP2006260631A (en) * | 2005-03-15 | 2006-09-28 | Tdk Corp | Magnetic recording and reproducing apparatus and its control method |
JP4271666B2 (en) * | 2005-03-16 | 2009-06-03 | Tdk株式会社 | Magnetic recording / reproducing apparatus and control method thereof, magnetic recording medium, and stamper for manufacturing magnetic recording medium |
US7706092B2 (en) * | 2007-09-12 | 2010-04-27 | Seagate Technology Llc | Null servo pattern for bit-patterned media |
US7944643B1 (en) | 2007-12-05 | 2011-05-17 | Wd Media, Inc. | Patterns for pre-formatted information on magnetic hard disk media |
US8018820B2 (en) * | 2008-08-15 | 2011-09-13 | Seagate Technology, Llc | Magnetic recording system using e-beam deflection |
US8000053B1 (en) * | 2008-12-23 | 2011-08-16 | Western Digital Technologies, Inc. | Write jog value determination for a disk drive |
US9685186B2 (en) * | 2009-02-27 | 2017-06-20 | Applied Materials, Inc. | HDD pattern implant system |
US20100258431A1 (en) * | 2009-04-10 | 2010-10-14 | Applied Materials, Inc. | Use special ion source apparatus and implant with molecular ions to process hdd (high density magnetic disks) with patterned magnetic domains |
SG174927A1 (en) | 2009-04-13 | 2011-12-29 | Applied Materials Inc | Modification of magnetic properties of films using ion and neutral beam implantation |
US8305705B1 (en) | 2010-05-05 | 2012-11-06 | Western Digital Technologies, Inc. | Disk drive cross correlating track crossing signal with ideal signal to calibrate jog value |
US8737001B2 (en) | 2010-09-15 | 2014-05-27 | Seagate Technology Llc | Bit patterned magnetic storage medium |
CN103959380B (en) | 2011-11-23 | 2017-08-29 | 应用材料公司 | Method for silica chemistry vapour deposition photoresist planarization |
US8879184B1 (en) | 2014-02-07 | 2014-11-04 | Seagate Technology Llc | Servo patterns including selectively magnetizable magnetic features |
US9105289B1 (en) | 2014-10-15 | 2015-08-11 | Seagate Technology Llc | Integrated servo field for memory device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3593331A (en) * | 1969-01-31 | 1971-07-13 | Ncr Co | Magnetic disc calibration track with diminishing apertures |
US4802050A (en) * | 1986-02-21 | 1989-01-31 | Brother Kogyo Kabushiki Kaisha | Magnetic recording medium |
US4935835A (en) * | 1988-11-10 | 1990-06-19 | Insite Peripherals, Inc. | Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature |
US5138511A (en) * | 1989-03-24 | 1992-08-11 | Sony Corporation | Magnetic recording disk in which the level of the surface of the data tracks, and servo tracks is higher than that of the guardbands |
EP0511622A2 (en) * | 1991-05-01 | 1992-11-04 | Hitachi Maxell Ltd. | Magnetic disk |
US5537282A (en) * | 1994-07-15 | 1996-07-16 | Treves; David | Data storage disk having improved tracking capability |
US5858474A (en) * | 1996-02-20 | 1999-01-12 | Seagate Technology, Inc. | Method of forming a magnetic media |
Family Cites Families (72)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4090145A (en) | 1969-03-24 | 1978-05-16 | Webb Joseph A | Digital quadrature demodulator |
DE2216077C3 (en) | 1972-04-01 | 1978-04-20 | Loewe Opta Gmbh, 1000 Berlin | Automatic track scan control circuit for video magnetic tape recorder and player |
US4131828A (en) | 1976-12-14 | 1978-12-26 | Sanyo Electric Co., Ltd. | Apparatus for rotatively driving a turn table |
IT1159939B (en) | 1978-10-18 | 1987-03-04 | Sits Soc It Telecom Siemens | RECEIVER FOR DATA TRANSMISSION SYSTEMS WITH SINGLE SIDE BANDWIDTH MODULATION WITH ATTENUED CARRIER |
US4308505A (en) | 1979-06-13 | 1981-12-29 | Trw, Inc. | Frequency detector device and method |
US4318141A (en) | 1979-12-07 | 1982-03-02 | International Business Machines Corp. | Buried servo recording systems and methods |
US4353093A (en) | 1981-05-11 | 1982-10-05 | Rca Corporation | Impulse noise reduction system for TV receivers |
US4414589A (en) | 1981-12-14 | 1983-11-08 | Northern Telecom Inc. | Embedded servo track following system and method for writing servo tracks |
JPS5997292A (en) | 1982-11-26 | 1984-06-05 | Victor Co Of Japan Ltd | Color television image pickup device |
JPS6083264A (en) | 1983-10-14 | 1985-05-11 | Nippon Gakki Seizo Kk | Frame-synchronized counter circuit |
US4841502A (en) | 1985-06-14 | 1989-06-20 | Kabushiki Kaisha Toshiba | Information recording system and reproducing for recording and reproducing information on a magneto-optical disk |
US4926408A (en) | 1985-06-14 | 1990-05-15 | Kabushiki Kaisha Toshiba | Magneto-optic recording/erasing system with simultaneous dual head control and disk error detection |
WO1992005552A1 (en) | 1986-03-04 | 1992-04-02 | Yoshihiro Nakamura | Magnetic recording device |
US4777544A (en) * | 1986-08-15 | 1988-10-11 | International Business Machine Corporation | Method and apparatus for in-situ measurement of head/recording medium clearance |
NL8602504A (en) | 1986-10-06 | 1988-05-02 | Philips Nv | OPTICALLY READABLE RECORD CARRIAGE FOR RECORDING INFORMATION, AN APPARATUS FOR MANUFACTURING SUCH RECORD CARRIER, AN APPARATUS FOR RECORDING INFORMATION ON SUCH RECORD CARRIERS AND AN ESTABLISHMENT DEVICE FOR RECORDS. |
US4825310A (en) | 1986-10-14 | 1989-04-25 | Konishiroku Photo Industries Co., Ltd. | Method and apparatus for recording servo synchronization information |
FR2608825B1 (en) | 1986-12-19 | 1994-12-30 | Enertec | DEVICE FOR DETECTING THE POSITION OF A MAGNETIC HEAD |
US4823205A (en) | 1988-02-08 | 1989-04-18 | International Business Machines Corporation | Capacitive sensor for head positioning in magnetic recording disk files |
JPH0695741B2 (en) | 1988-07-27 | 1994-11-24 | 三菱電機株式会社 | Automatic gain control circuit |
US5083226A (en) | 1988-09-22 | 1992-01-21 | Hitachi, Ltd. | Magnetic disk drive |
EP0378222B1 (en) * | 1989-01-11 | 1995-08-23 | Hitachi, Ltd. | Magnetic recording medium and method of magnetically recording and reading data |
US4942609A (en) | 1989-03-15 | 1990-07-17 | Magnetic Peripherals Inc. | Electronic flying integrity tester for disk drives |
DE3931441A1 (en) | 1989-09-21 | 1991-04-04 | Forschungszentrum Juelich Gmbh | SENSOR TO MEASURE MAGNETIC FLOW |
JP2534778B2 (en) | 1989-09-26 | 1996-09-18 | 株式会社日立製作所 | Information recording / reproducing system and information recording / reproducing apparatus |
WO1992002929A1 (en) | 1990-08-01 | 1992-02-20 | Maxtor Corporation | Sample data position error signal detection for digital sector servo |
US5241702A (en) | 1990-09-06 | 1993-08-31 | Telefonaktiebolaget L M Ericsson | D.c. offset compensation in a radio receiver |
US5303269A (en) | 1990-11-01 | 1994-04-12 | Chirp Corporation | Optically maximum A posteriori demodulator |
JP2611049B2 (en) | 1991-02-06 | 1997-05-21 | 富士通株式会社 | Settling monitoring method of tracking control device |
JP3166181B2 (en) | 1991-02-28 | 2001-05-14 | 株式会社日立製作所 | Magnetic storage device |
JP2653933B2 (en) | 1991-04-30 | 1997-09-17 | 富士通株式会社 | Offset detection method for magnetic disk drives |
US5347410A (en) | 1991-04-30 | 1994-09-13 | Fujitsu Limited | Sensitivity correcting circuit of servo signal detection on data surface and offset measuring circuit in magnetic disk unit |
EP0523299A1 (en) | 1991-07-18 | 1993-01-20 | International Business Machines Corporation | System and method for combining multiple composite video signals |
JPH0561491A (en) | 1991-09-02 | 1993-03-12 | Sanyo Electric Co Ltd | Karaoke device and its recording medium |
US5379171A (en) | 1991-09-25 | 1995-01-03 | Integral Peripherals | Microminiature hard disk drive |
EP0569610B1 (en) | 1992-05-13 | 1997-03-05 | Tandberg Data A/S | Method and apparatus for determining the tape position for a tape using dedicated servo format |
US5626941A (en) | 1992-05-27 | 1997-05-06 | Quantum Corporation | Thin film media for very low flying height/contact recording application |
JP3254743B2 (en) * | 1992-08-17 | 2002-02-12 | ソニー株式会社 | Writing method of positioning signal |
JPH06111502A (en) | 1992-09-30 | 1994-04-22 | Sony Corp | Magnetic disk device |
JP3135389B2 (en) | 1992-10-23 | 2001-02-13 | 松下電器産業株式会社 | Information reproducing method, information recording / reproducing method, information reproducing apparatus, recording medium, and optical head |
WO1994011867A1 (en) * | 1992-11-06 | 1994-05-26 | Mitsubishi Kasei Corporation | Magnetic recording medium, its recording/reproducing method and information processor which uses the medium and method |
US5343340A (en) | 1992-12-31 | 1994-08-30 | International Business Machines Corporation | Digital servo signal demodulation method and apparatus utilizing a partial-response maximum-likelihood (PRML) channel in a disk file |
US5424881A (en) | 1993-02-01 | 1995-06-13 | Cirrus Logic, Inc. | Synchronous read channel |
US5448430A (en) | 1993-08-05 | 1995-09-05 | International Business Machines Corporation | Track following servo demodulation |
DE69431614T2 (en) | 1993-08-25 | 2003-06-12 | Nippon Telegraph & Telephone | Magnetic field measuring method and device |
US5625508A (en) | 1993-08-26 | 1997-04-29 | International Business Machines Corporation | Method and apparatus for servo demodulation in a direct access storage device |
JPH07287942A (en) | 1994-04-15 | 1995-10-31 | Fujitsu Ltd | Disk device and data check retrial method for disk device |
US5483393A (en) | 1994-04-18 | 1996-01-09 | Western Digital Corporation | Disk drive having head positioning servo with improved servo read signal processing using median servo burst peak magnitudes |
US5602692A (en) | 1994-10-07 | 1997-02-11 | International Business Machines Corporation | Sampled position error signal demodulation system for banded data disk drives |
US5668678B1 (en) | 1994-11-14 | 2000-11-28 | Cirrus Logic Inc | Detecting servo data and servo bursts from discrete time samples of an analog read signal in a sampled amplitude read channel |
US5585975A (en) | 1994-11-17 | 1996-12-17 | Cirrus Logic, Inc. | Equalization for sample value estimation and sequence detection in a sampled amplitude read channel |
US5563746A (en) | 1994-11-17 | 1996-10-08 | Cirrus Logic, Inc. | Real time media defect scanning in a sampled amplitude read channel |
US5583706A (en) | 1994-11-17 | 1996-12-10 | Cirrus Logic, Inc. | Decimation DC offset control in a sampled amplitude read channel |
KR0132972B1 (en) | 1994-11-28 | 1998-04-18 | 배순훈 | Servo control apparatus of magneto-optical disc |
US5545989A (en) | 1995-01-19 | 1996-08-13 | Conner Peripherals, Inc. | Non-destructive in-situ landing velocity determination of magnetic rigid disk drives using back EMF from the spindle motor during shutdown |
US5594595A (en) | 1995-01-19 | 1997-01-14 | Conner Peripherals, Inc. | FM detection of slider-disk interface |
JPH08249602A (en) | 1995-03-06 | 1996-09-27 | Mitsubishi Electric Corp | Magnetic storing/reproducing method and magnetic reproducing device used for it, magnetic storing medium, and its manufacturing method |
US5696639A (en) | 1995-05-12 | 1997-12-09 | Cirrus Logic, Inc. | Sampled amplitude read channel employing interpolated timing recovery |
US5729396A (en) | 1995-05-12 | 1998-03-17 | Cirrus Logic, Inc. | Fault tolerant sync mark detector enabled relative to a frequency of an acquisition preamble for sampled amplitude recording |
US5632669A (en) | 1995-05-26 | 1997-05-27 | Censtor Corporation | Interactive method for lapping transducers |
US5760984A (en) | 1995-10-20 | 1998-06-02 | Cirrus Logic, Inc. | Cost reduced interpolated timing recovery in a sampled amplitude read channel |
US5726818A (en) | 1995-12-05 | 1998-03-10 | Cirrus Logic, Inc. | Magnetic disk sampled amplitude read channel employing interpolated timing recovery for synchronous detection of embedded servo data |
JP3245343B2 (en) | 1995-12-28 | 2002-01-15 | 富士通株式会社 | Disk device, phase demodulation device for disk device, and phase demodulation method for disk device |
US6104579A (en) * | 1996-04-11 | 2000-08-15 | Sony Corporation | Magnetic disk head having data zone and control signal zones which generate different lifts when flown over by a head slider |
JPH09293211A (en) | 1996-04-26 | 1997-11-11 | Fujitsu Ltd | Magnetic resistance effect head and magnetic recorder |
JPH09320008A (en) * | 1996-05-31 | 1997-12-12 | Fujitsu Ltd | Magnetic disk reproducing device and control method for the device |
US5786951A (en) | 1996-06-05 | 1998-07-28 | Cirrus Logic, Inc. | Sampled amplitude read channel employing a discrete time noise generator for calibration |
US5786950A (en) | 1996-07-29 | 1998-07-28 | Cirrus Logic, Inc. | PR4 sampled amplitude read channel employing an NRZI write modulator and a PR4/NRZI converter |
US5771127A (en) | 1996-07-29 | 1998-06-23 | Cirrus Logic, Inc. | Sampled amplitude read channel employing interpolated timing recovery and a remod/demod sequence detector |
US5838514A (en) * | 1996-08-21 | 1998-11-17 | International Business Machines Corporation | Method and apparatus for calibrating a thermal response of a magnetoresistive transducer |
US5999360A (en) * | 1996-10-15 | 1999-12-07 | Seagate Technology, Inc. | Disc drive servo system employing thermal signals |
JPH10293975A (en) * | 1997-04-21 | 1998-11-04 | Sony Corp | Magnetic disk device |
US5889641A (en) * | 1997-05-05 | 1999-03-30 | Seagate Technology, Inc. | Magneto-resistive magneto-optical head |
-
2000
- 2000-11-30 US US09/726,786 patent/US6510015B2/en not_active Expired - Fee Related
- 2000-11-30 WO PCT/US2000/042493 patent/WO2001043122A2/en active Search and Examination
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3593331A (en) * | 1969-01-31 | 1971-07-13 | Ncr Co | Magnetic disc calibration track with diminishing apertures |
US4802050A (en) * | 1986-02-21 | 1989-01-31 | Brother Kogyo Kabushiki Kaisha | Magnetic recording medium |
US4935835A (en) * | 1988-11-10 | 1990-06-19 | Insite Peripherals, Inc. | Magnetic media containing reference feature and methods for referencing magnetic head position to the reference feature |
US5138511A (en) * | 1989-03-24 | 1992-08-11 | Sony Corporation | Magnetic recording disk in which the level of the surface of the data tracks, and servo tracks is higher than that of the guardbands |
EP0511622A2 (en) * | 1991-05-01 | 1992-11-04 | Hitachi Maxell Ltd. | Magnetic disk |
US5537282A (en) * | 1994-07-15 | 1996-07-16 | Treves; David | Data storage disk having improved tracking capability |
US5858474A (en) * | 1996-02-20 | 1999-01-12 | Seagate Technology, Inc. | Method of forming a magnetic media |
Also Published As
Publication number | Publication date |
---|---|
WO2001043122A2 (en) | 2001-06-14 |
WO2001043122B1 (en) | 2002-06-20 |
US6510015B2 (en) | 2003-01-21 |
US20010036030A1 (en) | 2001-11-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2001043122A3 (en) | Magnetic disc having physical servo patterns with a magnetic carrier, and method of making and using the same | |
WO2002023538A3 (en) | Method and apparatus for minimizing slider fly heights over patterned media | |
CA2326174A1 (en) | Record carrier, playback device and method of recording information | |
EP0838808A3 (en) | Information recording medium which indicates information according to the wobbling of a track and information recording and reproducing apparatus | |
WO2000051112B1 (en) | Advanced servo writing method for hard disc drives | |
WO2003069609A3 (en) | Optical recording medium and playback method for the same | |
MY113649A (en) | Optical disk | |
WO1999024971A3 (en) | Magnetic recording/reproduction device | |
EP0606499A4 (en) | Device and method for disc recording. | |
EP2157574A3 (en) | Optical disk and a method for reproducing data from such an optical disk | |
DE69032626T2 (en) | Magnetic recording and reproducing method, magnetic recording medium, its manufacturing method and magnetic recording apparatus | |
CA2152689A1 (en) | Magnetic Disc Apparatus Employing Constant-Density Recording and Driver Access Method | |
EP0335517A3 (en) | Servo address system | |
GB2345377A (en) | Constant density servo information in a disc drive | |
KR900015127A (en) | Magnetic head | |
JPH08185676A (en) | Magnetic disk and disk device | |
EP0829853A3 (en) | Multi-track servo recording system | |
EP0149755A3 (en) | Optical information recording and reproducing apparatus | |
KR20030031455A (en) | Method and apparatus to distinguish effects of adjacent track encroachment from head thermal movement | |
EP1189213A3 (en) | Optical recording medium, apparatus for and method of manufacturing the same | |
EP0393207A4 (en) | Recording method and recording apparatus | |
JP4903343B2 (en) | Information carrier and apparatus for scanning the same | |
GB2358517A (en) | Reduced head population detection in a disc drive | |
CA2027870A1 (en) | Magnetooptical recording medium and method for manufacturing the same | |
KR100574941B1 (en) | Servo writing method for hard disk drives |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A2 Designated state(s): CN DE GB JP KR SG US |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
AK | Designated states |
Kind code of ref document: A3 Designated state(s): CN DE GB JP KR SG US |
|
AK | Designated states |
Kind code of ref document: B1 Designated state(s): CN DE GB JP KR SG US |
|
REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
NENP | Non-entry into the national phase |
Ref country code: JP |