WO2008105334A1 - Discrete track medium eccentricity detecting method and eccentricity detecting device - Google Patents
Discrete track medium eccentricity detecting method and eccentricity detecting device Download PDFInfo
- 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
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
- G11B5/48—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.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-045922 | 2007-02-26 | ||
JP2007045922A JP2008210451A (en) | 2007-02-26 | 2007-02-26 | Method and device for detecting eccentricity of discrete track medium |
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)
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)
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 |
-
2007
- 2007-02-26 JP JP2007045922A patent/JP2008210451A/en active Pending
-
2008
- 2008-02-22 WO PCT/JP2008/053030 patent/WO2008105334A1/en active Application Filing
Patent Citations (3)
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)
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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