SG42810A1 - Read error compensated in data storage systems - Google Patents

Read error compensated in data storage systems

Info

Publication number
SG42810A1
SG42810A1 SG1995002122A SG1995002122A SG42810A1 SG 42810 A1 SG42810 A1 SG 42810A1 SG 1995002122 A SG1995002122 A SG 1995002122A SG 1995002122 A SG1995002122 A SG 1995002122A SG 42810 A1 SG42810 A1 SG 42810A1
Authority
SG
Singapore
Prior art keywords
data storage
storage systems
read error
error compensated
compensated
Prior art date
Application number
SG1995002122A
Other languages
English (en)
Inventor
Thomas Charles Christensen
Matthew William Rooke
Michael Lee Workman
Original Assignee
Ibm
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 Ibm filed Critical Ibm
Publication of SG42810A1 publication Critical patent/SG42810A1/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing
    • 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
    • G11B5/54—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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G11B5/553—Details
    • G11B5/5534—Initialisation, calibration, e.g. cylinder "set-up"
    • 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
    • G11B5/54—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 into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5565—Track change, selection or acquisition by displacement of the head across disk tracks system adaptation for compensation of variations of physical parameters, e.g. temperature
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
    • G11B20/1816—Testing
    • G11B2020/183—Testing wherein at least one additional attempt is made to read or write the data when a first attempt is unsuccessful

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
SG1995002122A 1991-06-27 1992-06-23 Read error compensated in data storage systems SG42810A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/722,444 US5233487A (en) 1991-06-27 1991-06-27 Functional measurement of data head misregistration

Publications (1)

Publication Number Publication Date
SG42810A1 true SG42810A1 (en) 1997-10-17

Family

ID=24901866

Family Applications (1)

Application Number Title Priority Date Filing Date
SG1995002122A SG42810A1 (en) 1991-06-27 1992-06-23 Read error compensated in data storage systems

Country Status (5)

Country Link
US (1) US5233487A (de)
EP (1) EP0520734A3 (de)
JP (1) JP2589910B2 (de)
KR (1) KR960004580B1 (de)
SG (1) SG42810A1 (de)

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US5724205A (en) * 1993-03-19 1998-03-03 Goldstar Co., Ltd. Automatic tracking control device which uses different weightings with a number of incorrectable, correctable, and non-errors
WO1994024669A1 (en) * 1993-04-09 1994-10-27 Washington University Magnetic recording head with continuously monitored track following servo
DE4317190B4 (de) * 1993-05-22 2005-12-22 Deutsche Thomson-Brandt Gmbh Fehlerratenverringerung
US5379161A (en) * 1993-06-14 1995-01-03 International Business Machines Corporation Method and system for synchronization character location and prediction in a data storage system
US5550685A (en) * 1993-10-22 1996-08-27 Syquest Technology, Inc. Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal
US6483658B1 (en) * 1994-01-28 2002-11-19 Seagate Technology Llc Method of measuring the read-to-write offset in a disc drive having separate read and write elements
US6061201A (en) * 1994-02-07 2000-05-09 Seagate Technology, Inc. Method of measuring the read-to-write offset in a disc drive having separate read and write elements
JP3278284B2 (ja) * 1994-04-14 2002-04-30 富士通株式会社 ディスク装置、及びディスク装置の書き込み方法
US6181506B1 (en) * 1994-07-26 2001-01-30 Canon Kabushiki Kaisha Tracking control device
JP3232945B2 (ja) * 1994-08-22 2001-11-26 セイコーエプソン株式会社 前処理方法および入出力装置
KR0147228B1 (ko) * 1994-10-27 1998-10-15 김광호 자기 디스크 구동장치에서 오프-트랙을 이용한 트랙 추종 방법
JPH08293174A (ja) * 1995-04-21 1996-11-05 Fujitsu Ltd 許容オフトラック量設定方法及び装置並びにディスク装置
US5570244A (en) * 1995-05-25 1996-10-29 Conner Peripherals, Inc. Method and apparatus for controlling assertion of a write inhibit signal using separate threshold values for each of a plurality of recording surfaces
KR100194021B1 (ko) * 1996-04-24 1999-06-15 윤종용 하드 디스크 드라이브의 반복 추종 에러 제어방법
US6078461A (en) * 1997-06-12 2000-06-20 International Business Machines Corporation In situ offset correction for position error signal
USRE40413E1 (en) * 1998-11-06 2008-07-01 Purchased Patent Management Llc Method and apparatus for developing a dynamic servo signal from data
US6381088B1 (en) 1998-11-06 2002-04-30 Acorn Technologies, Inc. Apparatus for developing a dynamic servo signal from data in a magnetic disc drive and method
US6397369B1 (en) * 1998-11-06 2002-05-28 Acorn Technologies, Inc. Device for using information about the extent of errors in a signal and method
US6606215B1 (en) 1999-02-22 2003-08-12 Seagate Technology Llc Compensation for repeatable runout error
JP2000251419A (ja) * 1999-02-26 2000-09-14 Sony Corp 読み出し制御装置、再生装置、記録装置およびその方法
GB2364433A (en) 1999-05-07 2002-01-23 Seagate Technology Llc Repeatable runout compensation using iterative learning control in a disc storage system
DE10084854T1 (de) 1999-07-23 2002-07-25 Seagate Technology Llc Kompensierung eines wiederholbaren Runout unter Verwendung eines Lernalgorithmus mit geplanten Parametern
DE10085123T1 (de) 1999-10-28 2002-12-05 Seagate Technology Llc Verfahren zur Kalibrierung einer MR-Kopfgeometrie bei Plattenlaufwerken mit Selfservo-Schreiben
US6594103B1 (en) 1999-11-12 2003-07-15 Acorn Technologies, Inc. Read channel generating absolute value servo signal
US6545836B1 (en) * 1999-11-12 2003-04-08 Acorn Technologies, Inc. Servo control apparatus and method using absolute value input signals
US6952320B1 (en) 1999-12-16 2005-10-04 Seagate Technology Llc Virtual tracks for repeatable runout compensation
WO2002031826A2 (en) * 2000-10-10 2002-04-18 Seagate Technology Llc Method to measure signal decay and a device therefor
US7064913B2 (en) * 2002-01-09 2006-06-20 Quantum Corporation Enhanced read margining using dither enhanced write marginalization for mass data storage applications
US6853511B2 (en) * 2002-03-12 2005-02-08 Seagate Technology Llc Average position error measurement in a data storage device
US7372651B2 (en) * 2003-03-07 2008-05-13 Quantum Corporation Introducing a noise signal into a read-back signal when data is written to a removable data storage medium
JP2007048335A (ja) * 2005-08-05 2007-02-22 Hitachi Global Storage Technologies Netherlands Bv ディスク装置
JP4926738B2 (ja) * 2007-02-02 2012-05-09 昭和電工株式会社 磁気記録媒体の検査装置及び磁気記録媒体の検査方法
US9558064B2 (en) * 2015-01-28 2017-01-31 Micron Technology, Inc. Estimating an error rate associated with memory

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
GB1549440A (en) * 1976-07-06 1979-08-08 Data Recording Instr Co Magnetic storage devices
GB1549439A (en) * 1976-07-06 1979-08-08 Data Recording Instr Co Magnetic disc storage devices
US4135217A (en) * 1976-11-02 1979-01-16 Xerox Corporation Utilization of stored run-out information in a track following servo system
GB2085189B (en) * 1980-09-19 1984-03-28 Burroughs Corp Head position system for disc data store
US4513333A (en) * 1982-02-24 1985-04-23 Dymek Corporation Diagnostic recording
JPS58208973A (ja) * 1982-05-31 1983-12-05 Hitachi Ltd 信号再生装置のサ−ボ回路
US4485418A (en) * 1982-08-12 1984-11-27 Magnetic Peripherals, Inc. System and method of locating the center of a track on a magnetic storage disk
US4562494A (en) * 1983-04-07 1985-12-31 Verbatim Corporation Disk drive alignment analyzer
JPS623473A (ja) * 1985-06-28 1987-01-09 Toshiba Corp 磁気ヘツドの位置決め制御方式
US4706250A (en) * 1985-09-27 1987-11-10 International Business Machines Corporation Method and apparatus for correcting multibyte errors having improved two-level code structure
US4620244A (en) * 1985-11-20 1986-10-28 Seagate Technology Compensation method to correct thermally induced off-track errors in disc drives
US4816938A (en) * 1986-06-02 1989-03-28 Xebec Process for determining data disk track centers
US4947272A (en) * 1987-03-30 1990-08-07 Pioneer Electronic Corporation Signal reproducing device which offsets the tracking error signal for a digital tape player
DE3900683C2 (de) * 1989-01-12 2000-05-31 Philips Broadcast Television S Verfahren zur Einstellung der Spurlage bei einem Magnetbandgerät
JPH02235258A (ja) * 1989-03-08 1990-09-18 Fujitsu Ltd 磁気ディスク媒体の振れ回りオフトラック量の測定方法

Also Published As

Publication number Publication date
US5233487A (en) 1993-08-03
KR960004580B1 (ko) 1996-04-09
JPH05151727A (ja) 1993-06-18
KR930001192A (ko) 1993-01-16
JP2589910B2 (ja) 1997-03-12
EP0520734A3 (en) 1993-05-12
EP0520734A2 (de) 1992-12-30

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