DE60137899D1 - Methode zum Messen von Nichtlinearitäten von Magnetaufzeichnung/-wiedergabe, Magnetaufzeichnungs-/-wiedergabevorrichtung und LSI für Magnetaufzeichnung/-wiedergabe - Google Patents

Methode zum Messen von Nichtlinearitäten von Magnetaufzeichnung/-wiedergabe, Magnetaufzeichnungs-/-wiedergabevorrichtung und LSI für Magnetaufzeichnung/-wiedergabe

Info

Publication number
DE60137899D1
DE60137899D1 DE60137899T DE60137899T DE60137899D1 DE 60137899 D1 DE60137899 D1 DE 60137899D1 DE 60137899 T DE60137899 T DE 60137899T DE 60137899 T DE60137899 T DE 60137899T DE 60137899 D1 DE60137899 D1 DE 60137899D1
Authority
DE
Germany
Prior art keywords
magnetic recording
reproducing
nonlinearities
lsi
measuring
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.)
Expired - Lifetime
Application number
DE60137899T
Other languages
English (en)
Inventor
Hiroaki Ueno
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.)
Toshiba Storage Device Corp
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Application granted granted Critical
Publication of DE60137899D1 publication Critical patent/DE60137899D1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/36—Monitoring, i.e. supervising the progress of 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
    • G11B20/10009—Improvement or modification of read or write signals
    • 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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • G11B5/09—Digital recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—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 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—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 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor 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
    • G11B11/105—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 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor 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 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
    • G11B11/10502—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 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor 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 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 characterised by the transducing operation to be executed
    • G11B11/1053—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 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor 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 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 characterised by the transducing operation to be executed to compensate for the magnetic domain drift or time shift
    • 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
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/001—Controlling recording characteristics of record carriers or transducing characteristics of transducers by means not being part of their structure
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
  • Measuring Magnetic Variables (AREA)
DE60137899T 2000-11-30 2001-11-29 Methode zum Messen von Nichtlinearitäten von Magnetaufzeichnung/-wiedergabe, Magnetaufzeichnungs-/-wiedergabevorrichtung und LSI für Magnetaufzeichnung/-wiedergabe Expired - Lifetime DE60137899D1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000365874 2000-11-30
JP2001310365A JP3870333B2 (ja) 2000-11-30 2001-10-05 磁気記録再生装置および磁気記録再生用ｌｓｉ

Publications (1)

Publication Number Publication Date
DE60137899D1 true DE60137899D1 (de) 2009-04-23

Family

ID=26605002

Family Applications (1)

Application Number Title Priority Date Filing Date
DE60137899T Expired - Lifetime DE60137899D1 (de) 2000-11-30 2001-11-29 Methode zum Messen von Nichtlinearitäten von Magnetaufzeichnung/-wiedergabe, Magnetaufzeichnungs-/-wiedergabevorrichtung und LSI für Magnetaufzeichnung/-wiedergabe

Country Status (5)

Country Link
US (1) US6934100B2 (de)
EP (3) EP1211672B1 (de)
JP (2) JP3870333B2 (de)
KR (2) KR100808611B1 (de)
DE (1) DE60137899D1 (de)

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US7248424B2 (en) 2003-04-25 2007-07-24 Fujitsu Limited Nonlinearity measuring method, nonlinearity measuring unit, magnetic recording/regenerating unit and LSI for magnetic recording/regenerating
JP3906226B2 (ja) * 2003-04-25 2007-04-18 富士通株式会社 非線形性測定方法，非線形性測定装置，磁気記録再生装置および磁気記録再生用ｌｓｉ
US7889448B2 (en) * 2004-11-15 2011-02-15 Hitachi Global Storage Technologies, Netherlands, B.V. Magnetic spacing measurement
US7193801B2 (en) * 2004-11-18 2007-03-20 Agere Systems, Inc. Method and apparatus for testing a servo circuit of a read/write head system
JP4504928B2 (ja) * 2006-01-18 2010-07-14 新科實業有限公司 薄膜磁気ヘッドの書き込み素子の特性評価方法
US8441752B1 (en) * 2006-08-30 2013-05-14 Marvell International Ltd. Dibit pulse extraction methods and systems
CN101711409B (zh) * 2007-05-18 2011-11-02 Xyratex技术有限公司 生成、分析数据测试模式以及测试数据存储磁盘介质和/或读/写头的装置和方法
JP2009074941A (ja) * 2007-09-20 2009-04-09 Fujitsu Ltd 周期信号の振幅測定方法および装置並びに磁気ヘッドの試験方法および装置
JP2009087440A (ja) * 2007-09-28 2009-04-23 Fujitsu Ltd 制御装置、記憶装置、ｌｓｉおよび記録補償方法
JP5178844B2 (ja) 2007-12-21 2013-04-10 エルエスアイ コーポレーション 記録チャネルにおける適応等化のためのシステムおよび方法
US7924523B2 (en) * 2007-12-21 2011-04-12 Lsi Corporation Frequency domain approach for efficient computation of fixed-point equalization targets
US7924518B2 (en) * 2008-08-27 2011-04-12 Lsi Corporation Systems and methods for adaptive write pre-compensation
US7859780B2 (en) * 2008-08-27 2010-12-28 Agere Systems Inc. Systems and methods for on-the-fly write pre-compensation estimation
US9281908B2 (en) * 2008-10-08 2016-03-08 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods for memory efficient signal and noise estimation
US7948702B2 (en) * 2008-12-18 2011-05-24 Lsi Corporation Systems and methods for controlling data equalization
US7929240B2 (en) * 2008-12-18 2011-04-19 Lsi Corporation Systems and methods for adaptive MRA compensation
US7965467B2 (en) * 2008-12-18 2011-06-21 Lsi Corporation Systems and methods for generating equalization data
US8154815B2 (en) * 2008-12-18 2012-04-10 Lsi Corporation Systems and methods for generating equalization data using shift register architecture
US7974030B2 (en) 2008-12-23 2011-07-05 Lsi Corporation Systems and methods for dibit correction
US7948699B2 (en) * 2009-01-02 2011-05-24 Lsi Corporation Systems and methods for equalizer optimization in a storage access retry
US7957251B2 (en) 2009-02-16 2011-06-07 Agere Systems Inc. Systems and methods for reduced latency loop recovery
US7969337B2 (en) * 2009-07-27 2011-06-28 Lsi Corporation Systems and methods for two tier sampling correction in a data processing circuit
US8139305B2 (en) * 2009-09-14 2012-03-20 Lsi Corporation Systems and methods for timing and gain acquisition
JP2012009108A (ja) * 2010-06-24 2012-01-12 Toshiba Corp 非線形性測定装置、非線形性測定方法及び磁気記録再生装置
US8854752B2 (en) 2011-05-03 2014-10-07 Lsi Corporation Systems and methods for track width determination
US8762440B2 (en) 2011-07-11 2014-06-24 Lsi Corporation Systems and methods for area efficient noise predictive filter calibration
US8625225B1 (en) 2011-08-29 2014-01-07 Western Digital Technologies, Inc. Disk drive compensating for asymmetry of magnetoresistive read element
US8829901B2 (en) * 2011-11-04 2014-09-09 Honeywell International Inc. Method of using a magnetoresistive sensor in second harmonic detection mode for sensing weak magnetic fields
US9112538B2 (en) 2013-03-13 2015-08-18 Avago Technologies General Ip (Singapore) Pte. Ltd. Systems and methods for loop feedback
US8848776B1 (en) 2013-03-25 2014-09-30 Lsi Corporation Systems and methods for multi-dimensional signal equalization
US8929010B1 (en) 2013-08-21 2015-01-06 Lsi Corporation Systems and methods for loop pulse estimation

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US5761212A (en) * 1993-07-01 1998-06-02 Cirrus Logic, Inc. Channel quality
US5493454A (en) * 1994-10-04 1996-02-20 Quantum Corporation Write precompensation optimization in a PRML channel using a selected PRML signal level
US5784296A (en) * 1996-04-30 1998-07-21 Quantum Corporation Method and apparatus for spectral analysis in a disk recording system
JPH10134524A (ja) * 1996-10-30 1998-05-22 Hitachi Ltd 媒体欠陥検出・登録方法及びこれを用いた装置
JP3522994B2 (ja) * 1996-12-09 2004-04-26 株式会社日立製作所 磁気記録再生装置
JP3016368B2 (ja) * 1997-01-16 2000-03-06 日本電気株式会社 記録磁化状態測定装置
JP3677141B2 (ja) * 1997-05-30 2005-07-27 株式会社日立グローバルストレージテクノロジーズ 記録等化器及びそれを用いた磁気記録再生装置
KR100518512B1 (ko) * 1998-01-15 2005-11-25 삼성전자주식회사 리드 바이어스 전류 설정 방법
JPH11250408A (ja) * 1998-02-27 1999-09-17 Hewlett Packard Japan Ltd 遅延量校正回路及び方法
JPH11250407A (ja) * 1998-02-27 1999-09-17 Hewlett Packard Japan Ltd Ｎｌｔｓ補正回路
US6788481B2 (en) * 2002-03-21 2004-09-07 International Business Machines Corporation Process for measuring nonlinear transition shift (NLTS) at high recording densities with a giant magetoresistive (GMR) head

Also Published As

Publication number Publication date
JP2006196175A (ja) 2006-07-27
EP1211672B1 (de) 2009-03-11
US20020105744A1 (en) 2002-08-08
KR100808615B1 (ko) 2008-03-03
KR20020042504A (ko) 2002-06-05
EP1852853A1 (de) 2007-11-07
EP1852854A1 (de) 2007-11-07
JP3870333B2 (ja) 2007-01-17
KR20070054610A (ko) 2007-05-29
KR100808611B1 (ko) 2008-03-07
EP1211672A3 (de) 2006-02-01
EP1211672A2 (de) 2002-06-05
JP2002230709A (ja) 2002-08-16
US6934100B2 (en) 2005-08-23

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8327 Change in the person/name/address of the patent owner

Owner name: TOSHIBA STORAGE DEVICE CORP., TOKYO, JP

8328 Change in the person/name/address of the agent

Representative=s name: SEEGER SEEGER LINDNER PARTNERSCHAFT PATENTANWAELTE