DE3577493D1 - Pruefverfahren fuer bestandteile eines magnetischen speichersystems. - Google Patents

Pruefverfahren fuer bestandteile eines magnetischen speichersystems.

Info

Publication number
DE3577493D1
DE3577493D1 DE8585303888T DE3577493T DE3577493D1 DE 3577493 D1 DE3577493 D1 DE 3577493D1 DE 8585303888 T DE8585303888 T DE 8585303888T DE 3577493 T DE3577493 T DE 3577493T DE 3577493 D1 DE3577493 D1 DE 3577493D1
Authority
DE
Germany
Prior art keywords
components
storage system
test method
magnetic storage
magnetic
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 - Fee Related
Application number
DE8585303888T
Other languages
English (en)
Inventor
Frank J Sordello
Andrew M Rose
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.)
Unisys Corp
Original Assignee
Unisys Corp
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 Unisys Corp filed Critical Unisys Corp
Application granted granted Critical
Publication of DE3577493D1 publication Critical patent/DE3577493D1/de
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G11B20/1816—Testing
    • G11B20/182—Testing using test patterns

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Digital Magnetic Recording (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
DE8585303888T 1984-06-05 1985-06-03 Pruefverfahren fuer bestandteile eines magnetischen speichersystems. Expired - Fee Related DE3577493D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/617,431 US4612586A (en) 1984-06-05 1984-06-05 Method for measuring timing asymmetry in a magnetic storage system

Publications (1)

Publication Number Publication Date
DE3577493D1 true DE3577493D1 (de) 1990-06-07

Family

ID=24473629

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8585303888T Expired - Fee Related DE3577493D1 (de) 1984-06-05 1985-06-03 Pruefverfahren fuer bestandteile eines magnetischen speichersystems.

Country Status (4)

Country Link
US (1) US4612586A (de)
EP (1) EP0168155B1 (de)
JP (1) JPS6192475A (de)
DE (1) DE3577493D1 (de)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0731877B2 (ja) * 1985-07-03 1995-04-10 株式会社日立製作所 情報記録再生方法及び装置
JPH0734294B2 (ja) * 1985-11-08 1995-04-12 株式会社日立製作所 記録媒体の欠陥検出方法及び欠陥検出装置
US4821125A (en) * 1986-06-11 1989-04-11 International Business Machines Corporation Compensation of write current adn delta-V for recording component and radial position
US4829388A (en) * 1986-08-04 1989-05-09 Fuji Photo Film Co., Ltd. Magnetic recording apparatus
US5025327A (en) * 1986-10-17 1991-06-18 Unisys Corp. Magnetic disk write precompensation method and apparatus which takes into account variations in head/disk characteristics
US4809088A (en) * 1986-12-05 1989-02-28 Western Digital Corporation Integrated system for implementation of read window margining and write precompensaton in disk drives
IE60167B1 (en) * 1987-06-10 1994-06-15 Benares Limited Method and apparatus for testing characteristics of a flop disc and floppy disc drive
US4879672A (en) * 1987-08-21 1989-11-07 Control Data Corporation Method and apparatus for testing runout velocity and acceleration on a surface
JP2647875B2 (ja) * 1987-12-25 1997-08-27 株式会社日立製作所 光磁気信号記録再生方法
US4942609A (en) * 1989-03-15 1990-07-17 Magnetic Peripherals Inc. Electronic flying integrity tester for disk drives
US5068754A (en) * 1989-11-22 1991-11-26 Seagate Technology, Inc. Method and apparatus for measuring bit shift
US5109304A (en) * 1989-12-04 1992-04-28 Maxtor Corporation Method of apparatus for detecting defects in data apparatus such as magnetic storage apparatus
US5262904A (en) * 1991-01-22 1993-11-16 International Business Machines Corporation Method and apparatus for measuring and compensating nonlinear bitshift
US5357520A (en) * 1992-01-31 1994-10-18 International Business Machines Corporation Method and apparatus for precompensation value determination in a PRML data channel
US5392295A (en) * 1992-07-30 1995-02-21 International Business Machines Corporation Error measurement circuit
US5424881A (en) 1993-02-01 1995-06-13 Cirrus Logic, Inc. Synchronous read channel
US5469305A (en) * 1993-12-17 1995-11-21 Seagate Technology, Inc. AC timing asymmetry reduction circuit including summing DC offset voltage with timing signal
US6032262A (en) * 1995-04-18 2000-02-29 Emc Corporation Disk drive reliability determination system and method
JPWO2007116472A1 (ja) * 2006-03-31 2009-08-20 富士通株式会社 ヘッド試験装置およびヘッド試験解析システム
US7881006B2 (en) * 2008-02-08 2011-02-01 Seagate Technology Llc Long-term asymmetry tracking in magnetic recording devices
US20140288883A1 (en) * 2013-03-25 2014-09-25 Infineon Technologies Ag Method for determining an angle of a magnetic pole of a rotating object
US9495987B1 (en) * 2015-05-01 2016-11-15 Seagate Technology Llc Noise mitigation for write precompensation tuning

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3686682A (en) * 1970-08-17 1972-08-22 Burroughs Corp Method and apparatus for testing magnetic disc files
US3947875A (en) * 1974-08-06 1976-03-30 International Business Machines Corporation Magnetic recorder test article and methods
US4009490A (en) * 1975-07-07 1977-02-22 Ncr Corporation PLO phase detector and corrector
US3996612A (en) * 1975-07-07 1976-12-07 Ncr Corporation Test code generator
US4142215A (en) * 1977-12-02 1979-02-27 The Telex Corporation Tape drive tester
US4333177A (en) * 1979-10-31 1982-06-01 Ampex Corporation Test control circuit for multichannel apparatus such as tape recorders and the like
JPS59180820A (ja) * 1983-03-31 1984-10-15 Toshiba Corp 磁気ヘツド特性測定回路

Also Published As

Publication number Publication date
JPH0568002B2 (de) 1993-09-28
JPS6192475A (ja) 1986-05-10
EP0168155B1 (de) 1990-05-02
US4612586A (en) 1986-09-16
EP0168155A1 (de) 1986-01-15

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee