WO2008105334A1 - Discrete track medium eccentricity detecting method and eccentricity detecting device - Google Patents

Discrete track medium eccentricity detecting method and eccentricity detecting device Download PDF

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Publication number
WO2008105334A1
WO2008105334A1 PCT/JP2008/053030 JP2008053030W WO2008105334A1 WO 2008105334 A1 WO2008105334 A1 WO 2008105334A1 JP 2008053030 W JP2008053030 W JP 2008053030W WO 2008105334 A1 WO2008105334 A1 WO 2008105334A1
Authority
WO
WIPO (PCT)
Prior art keywords
eccentricity
detecting
track
eccentricity detecting
dtm
Prior art date
Application number
PCT/JP2008/053030
Other languages
French (fr)
Japanese (ja)
Inventor
Hiroyuki Ono
Original Assignee
International Manufacturing And Engineering Services Co., 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 International Manufacturing And Engineering Services Co., Ltd. filed Critical International Manufacturing And Engineering Services Co., Ltd.
Publication of WO2008105334A1 publication Critical patent/WO2008105334A1/en

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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
    • G11B5/59627—Aligning for runout, eccentricity or offset compensation

Landscapes

  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

[PROBLEMS] To provide a track eccentricity detecting method and an eccentricity detecting device for detecting the amount of eccentricity and the direction of the eccentricity of a track of a DTM without referencing a servo pattern. [MEANS FOR SOLVING PROBLEMS] An eccentricity detecting method for detecting the eccentricity of the center of the track of a DTM having a track where a magnetic body is present and a groove where a magnetic material is absent and the eccentricity of the center of the rotation of the spindle motor. The method comprises a step of writing predetermined data in a predetermined region while stepwise moving the head radially with respect to the DTM, a step of reading the written data by means of the head made to be at rest in the predetermined region, a rest detection step of detecting the amount of eccentricity and the direction of the eccentricity by detecting the number of crossings of the track by the head while the DTM rotates by a predetermined amount and their timings according to the read signal.
PCT/JP2008/053030 2007-02-26 2008-02-22 Discrete track medium eccentricity detecting method and eccentricity detecting device WO2008105334A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007045922A JP2008210451A (en) 2007-02-26 2007-02-26 Method and device for detecting eccentricity of discrete track medium
JP2007-045922 2007-02-26

Publications (1)

Publication Number Publication Date
WO2008105334A1 true WO2008105334A1 (en) 2008-09-04

Family

ID=39721169

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/053030 WO2008105334A1 (en) 2007-02-26 2008-02-22 Discrete track medium eccentricity detecting method and eccentricity detecting device

Country Status (2)

Country Link
JP (1) JP2008210451A (en)
WO (1) WO2008105334A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8335047B2 (en) 2010-10-07 2012-12-18 HGST Netherlands B.V. Patterned media with offset PES servo segments with length encoded track position
US8363348B2 (en) 2010-10-07 2013-01-29 HGST Netherlands B.V. Patterned media with structured PES servo segments encoding local track position
US8477442B2 (en) 2010-05-11 2013-07-02 HGST Netherlands B.V. Patterned media for self-servowriting integrated servo fields

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6216248A (en) * 1985-07-15 1987-01-24 Hitachi Ltd Information recording and reproducing device
JPH0438776A (en) * 1990-06-01 1992-02-07 Fujitsu Ltd Magnetic disk device and method for estimating decentering amount of magnetic disk medium
JP2003281841A (en) * 2002-03-22 2003-10-03 Tdk Corp Magnetic recording medium and magnetic recorder

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6216248A (en) * 1985-07-15 1987-01-24 Hitachi Ltd Information recording and reproducing device
JPH0438776A (en) * 1990-06-01 1992-02-07 Fujitsu Ltd Magnetic disk device and method for estimating decentering amount of magnetic disk medium
JP2003281841A (en) * 2002-03-22 2003-10-03 Tdk Corp Magnetic recording medium and magnetic recorder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8477442B2 (en) 2010-05-11 2013-07-02 HGST Netherlands B.V. Patterned media for self-servowriting integrated servo fields
US8335047B2 (en) 2010-10-07 2012-12-18 HGST Netherlands B.V. Patterned media with offset PES servo segments with length encoded track position
US8363348B2 (en) 2010-10-07 2013-01-29 HGST Netherlands B.V. Patterned media with structured PES servo segments encoding local track position

Also Published As

Publication number Publication date
JP2008210451A (en) 2008-09-11

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