DE19983249T1 - Asynchroner Digital-Demudulator und Verfahren für ein Servo-Muster vom Null-Typ - Google Patents

Asynchroner Digital-Demudulator und Verfahren für ein Servo-Muster vom Null-Typ

Info

Publication number
DE19983249T1
DE19983249T1 DE19983249T DE19983249T DE19983249T1 DE 19983249 T1 DE19983249 T1 DE 19983249T1 DE 19983249 T DE19983249 T DE 19983249T DE 19983249 T DE19983249 T DE 19983249T DE 19983249 T1 DE19983249 T1 DE 19983249T1
Authority
DE
Germany
Prior art keywords
demudulator
zero
servo pattern
type servo
asynchronous digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19983249T
Other languages
English (en)
Inventor
Alexei H Sacks
Timothy F Ellis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seagate Technology LLC
Original Assignee
Seagate Technology LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seagate Technology LLC filed Critical Seagate Technology LLC
Publication of DE19983249T1 publication Critical patent/DE19983249T1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/58Disposition 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
    • G11B5/596Disposition 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
    • G11B5/59633Servo formatting
    • G11B5/59655Sector, sample or burst servo format
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/10009Improvement or modification of read or write signals
    • G11B20/10037A/D conversion, D/A conversion, sampling, slicing and digital quantisation or adjusting parameters thereof
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • G11B21/02Driving or moving of heads
    • G11B21/08Track changing or selecting during transducing operation
    • G11B21/081Access to indexed tracks or parts of continuous track
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/54Disposition 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 into or out of its operative position or across tracks
    • G11B5/55Track change, selection or acquisition by displacement of the head
    • G11B5/5521Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5552Track change, selection or acquisition by displacement of the head across disk tracks using fine positioning means for track acquisition separate from the coarse (e.g. track changing) positioning means
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48Disposition 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
    • G11B5/58Disposition 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
    • G11B5/596Disposition 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
    • G11B5/59688Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00Record carriers by type
    • G11B2220/20Disc-shaped record carriers
DE19983249T 1998-05-21 1999-05-18 Asynchroner Digital-Demudulator und Verfahren für ein Servo-Muster vom Null-Typ Withdrawn DE19983249T1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US8627898P 1998-05-21 1998-05-21
US8627998P 1998-05-21 1998-05-21
US09/268,584 US6243224B1 (en) 1998-05-21 1999-03-15 Asynchronous digital demodulator and method for a null-type servo pattern
PCT/US1999/011029 WO1999060566A1 (en) 1998-05-21 1999-05-18 Asynchronous digital demodulator and method for a null-type servo pattern

Publications (1)

Publication Number Publication Date
DE19983249T1 true DE19983249T1 (de) 2001-05-17

Family

ID=27375369

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19983249T Withdrawn DE19983249T1 (de) 1998-05-21 1999-05-18 Asynchroner Digital-Demudulator und Verfahren für ein Servo-Muster vom Null-Typ

Country Status (7)

Country Link
US (1) US6243224B1 (de)
JP (1) JP2002516449A (de)
KR (1) KR20010043740A (de)
CN (1) CN1302429A (de)
DE (1) DE19983249T1 (de)
GB (1) GB2357892B (de)
WO (1) WO1999060566A1 (de)

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US6594323B1 (en) * 1999-10-04 2003-07-15 Lucent Technologies Inc. Method and apparatus for integrating isochronous and asynchronous communication in a network
US6587291B2 (en) 2001-05-07 2003-07-01 Maxtor Corporation Asynchronously sampling wide bi-phase codes
US6700728B2 (en) * 2001-06-04 2004-03-02 International Business Machines Corporation Method and disk drive for enhanced performance in the presence of stationary PES outliers
US7839594B2 (en) 2001-06-28 2010-11-23 Stmicroelectronics, Inc. Data-storage disk having few or no spin-up wedges and method for writing servo wedges onto the disk
US7830630B2 (en) 2001-06-28 2010-11-09 Stmicroelectronics, Inc. Circuit and method for detecting the phase of a servo signal
US7430082B2 (en) 2001-06-28 2008-09-30 Stmicroelectronics, Inc. Circuit and method for demodulating a servo position burst
US6943970B2 (en) * 2001-09-06 2005-09-13 Fujitsu Limited Position demodulating method and circuit of disk apparatus
US7023631B2 (en) * 2002-11-07 2006-04-04 Seagate Technology Llc Bi-frequency servo pattern
US7106548B2 (en) * 2003-07-22 2006-09-12 Matsushita Electric Industrial Co., Ltd. Methods for WORF improvement in conditional servowriting
US7227714B2 (en) * 2003-07-22 2007-06-05 Matsushita Electric Industrial Co., Ltd. Methods for conditional servowriting
US7136251B2 (en) * 2003-12-24 2006-11-14 Matsushita Electric Industrial, Co., Ltd. Methods for WORF improvement in conditional servowriting
US6980389B1 (en) 2004-02-27 2005-12-27 Western Digital Technologies, Inc. Disk drive having a disk including a servo burst pattern having a normal servo burst field and a quadrature servo burst field
US7286313B2 (en) * 2004-05-26 2007-10-23 Seagate Technology, Llc Correcting radial incoherence in servo track sensing
US7023637B1 (en) 2004-06-01 2006-04-04 Western Digital Technologies, Inc. Disk drive having a disk including a servo burst pattern that improves the signal to noise ratio during track following for writing
US6995526B1 (en) * 2004-08-09 2006-02-07 National Semiconductor Corporation Digitally controlled vertical C linearity correction with constant start and end points without using an AGC
US7064914B1 (en) 2004-12-22 2006-06-20 Seagate Technology Llc Position error signal quality
US7440224B2 (en) * 2006-01-23 2008-10-21 Toshiba Corporation Disk drive servo
US7721049B2 (en) * 2006-03-27 2010-05-18 Kabuhsiki Kaisha Toshiba Disk drive write method
US7457066B2 (en) * 2006-05-31 2008-11-25 Kabushiki Kiasha Toshiba Method and apparatus for phase-shift null-burst-pattern
US20070279781A1 (en) * 2006-05-31 2007-12-06 Toshiba America Information Systems, Inc. Channel training method and apparatus
US7453660B2 (en) * 2006-05-31 2008-11-18 Kabushiki Kaisha Toshiba Shock feed forward adaptive filters
US7468859B2 (en) * 2006-05-31 2008-12-23 Kabushiki Kaisha Toshiba Voice coil motor effective resistance determination
US20070279788A1 (en) * 2006-05-31 2007-12-06 Toshiba America Information Systems, Inc. Method and apparatus to perform defect scanning
US20070279782A1 (en) * 2006-05-31 2007-12-06 Rydhan Abdul R Method and apparatus for determining offset between read and write transducers in a disk drive
US7436616B2 (en) * 2006-05-31 2008-10-14 Toshiba Corporation Current pulsing for unloading
US20070279790A1 (en) * 2006-05-31 2007-12-06 Tanner Brian K Adjustable output voltage regulator for disk drive
JP4327824B2 (ja) 2006-06-30 2009-09-09 株式会社東芝 磁気ディスク装置、サーボ書込み方法及び検査方法
US7724844B2 (en) * 2007-01-31 2010-05-25 Seagate Technology Llc Detection of servo data for a servo system
US7576942B1 (en) * 2008-04-22 2009-08-18 Seagate Technology Llc Servo sector format with large lithographic tolerances
US8295002B1 (en) 2009-10-12 2012-10-23 Marvell International Ltd. Null servo demodulation for short servo wedge in disk storage systems
US9190105B1 (en) 2014-05-22 2015-11-17 Guzik Technical Enterprises Radially-coherent reading and writing system and method for a magnetic disk
US9230584B1 (en) * 2015-03-02 2016-01-05 Kabushiki Kaisha Toshiba Position demodulation apparatus and position demodulation method

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GB2039078B (en) * 1978-12-27 1982-11-24 Ibm Sampled data servo positioning system
DE262690T1 (de) 1982-05-10 1989-01-05 Digital Equipment Corp., Maynard, Mass., Us Positioniersteuerungsverfahren mit sowohl kontinuierlichen als auch angefuegten informationen fuer einen magnetplattenspeicher.
EP0097209B1 (de) * 1982-06-18 1987-11-04 International Business Machines Corporation Magnetische Aufzeichnungsplatte und Magnetplattenvorrichtung unter Verwendung eines Servosektors für Kopfpositionierung
US4535372A (en) 1983-06-29 1985-08-13 Storage Technology Corporation Position tracking servo control systems and methods
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US5117408A (en) 1989-09-29 1992-05-26 Seagate Technology, Inc. Correlation of sectored servo position information
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US5041926A (en) * 1989-11-13 1991-08-20 Hewlett-Packard Company Track position syncopation cancellation in a disk drive
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Also Published As

Publication number Publication date
US6243224B1 (en) 2001-06-05
JP2002516449A (ja) 2002-06-04
WO1999060566A1 (en) 1999-11-25
KR20010043740A (ko) 2001-05-25
GB2357892A (en) 2001-07-04
GB0028725D0 (en) 2001-01-10
CN1302429A (zh) 2001-07-04
GB2357892B (en) 2002-09-18

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: SEAGATE TECHNOLOGY LLC, SCOTTS VALLEY, CALIF., US

8139 Disposal/non-payment of the annual fee