WO1998016922A1 - Disc drive servo system employing thermal signals - Google Patents
Disc drive servo system employing thermal signals Download PDFInfo
- Publication number
- WO1998016922A1 WO1998016922A1 PCT/US1997/018325 US9718325W WO9816922A1 WO 1998016922 A1 WO1998016922 A1 WO 1998016922A1 US 9718325 W US9718325 W US 9718325W WO 9816922 A1 WO9816922 A1 WO 9816922A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- disc
- servo
- magnetoresistive element
- user data
- regions
- 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
- G11B5/012—Recording on, or reproducing or erasing from, magnetic disks
-
- 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
-
- 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
-
- 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
- G11B5/59633—Servo formatting
-
- 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
- G11B5/59683—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 for magnetoresistive heads
-
- 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
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
-
- 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
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9906721A GB2333176B (en) | 1996-10-15 | 1997-10-10 | Disc drive servo system employing thermal signals |
DE19782063T DE19782063T1 (en) | 1996-10-15 | 1997-10-10 | Servo system for disk drives using thermal signals |
JP51846498A JP2001524244A (en) | 1996-10-15 | 1997-10-10 | Disk drive servo system using heat signal |
HK99105877A HK1021241A1 (en) | 1996-10-15 | 1999-12-14 | Disc drive servo system employing thermal signals |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2837196P | 1996-10-15 | 1996-10-15 | |
US60/028,371 | 1996-10-15 | ||
US08/793,327 US5999360A (en) | 1996-10-15 | 1997-03-14 | Disc drive servo system employing thermal signals |
US08/793,327 | 1997-03-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998016922A1 true WO1998016922A1 (en) | 1998-04-23 |
Family
ID=26703615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/018325 WO1998016922A1 (en) | 1996-10-15 | 1997-10-10 | Disc drive servo system employing thermal signals |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2001524244A (en) |
DE (1) | DE19782063T1 (en) |
GB (1) | GB2333176B (en) |
HK (1) | HK1021241A1 (en) |
WO (1) | WO1998016922A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8665549B2 (en) | 2011-09-29 | 2014-03-04 | HGST Netherlands B.V. | Method for creating burst magnitude servo patterns with unipolar bits on a magnetic media of a magnetic data recording system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5527110A (en) * | 1993-04-30 | 1996-06-18 | International Business Machines Corporation | Method and apparatus for detecting asperities on magnetic disks using thermal proximity imaging |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02232803A (en) * | 1989-03-06 | 1990-09-14 | Nec Corp | Magnetic head |
-
1997
- 1997-10-10 GB GB9906721A patent/GB2333176B/en not_active Expired - Fee Related
- 1997-10-10 JP JP51846498A patent/JP2001524244A/en active Pending
- 1997-10-10 WO PCT/US1997/018325 patent/WO1998016922A1/en not_active Application Discontinuation
- 1997-10-10 DE DE19782063T patent/DE19782063T1/en not_active Withdrawn
-
1999
- 1999-12-14 HK HK99105877A patent/HK1021241A1/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5527110A (en) * | 1993-04-30 | 1996-06-18 | International Business Machines Corporation | Method and apparatus for detecting asperities on magnetic disks using thermal proximity imaging |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8665549B2 (en) | 2011-09-29 | 2014-03-04 | HGST Netherlands B.V. | Method for creating burst magnitude servo patterns with unipolar bits on a magnetic media of a magnetic data recording system |
Also Published As
Publication number | Publication date |
---|---|
JP2001524244A (en) | 2001-11-27 |
HK1021241A1 (en) | 2000-06-02 |
GB9906721D0 (en) | 1999-05-19 |
DE19782063T1 (en) | 1999-10-14 |
GB2333176A (en) | 1999-07-14 |
GB2333176B (en) | 2000-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6216242B1 (en) | Multiple-track magneto-resistive certification and thermal asperity test head | |
US6462904B1 (en) | Timing based servo system for magnetic tape systems | |
US5999360A (en) | Disc drive servo system employing thermal signals | |
US6529341B1 (en) | Magnetic recording/reproduction device using preformat information | |
US6563673B2 (en) | Method and apparatus for minimizing slider fly heights over patterned media | |
US6388829B1 (en) | High servo sampling disk drive with minimum overhead | |
US20020154432A1 (en) | Frequency modulation pattern for disk drive assemblies | |
US7515384B2 (en) | Method and apparatus for providing a three stepped air bearing having a funnel structure for controlling air flow to improve fly height performance | |
JPH05274832A (en) | Method for writing data surface servo pattern in magnetic disk device | |
US6657801B1 (en) | Disk drive with improved characterization segment pattern and method of recording the same | |
US20020145818A1 (en) | Method and apparatus for estimating the flyheight of an airbearing slider in a storage device | |
JP2004110896A5 (en) | ||
JP2002150729A (en) | Magnetic disk device and servowrite system of magnetic recording/reproducing device | |
US6657809B2 (en) | Method and apparatus for positioning a transducer using a phase difference in surface profile variations on a storage medium | |
EP0034938A2 (en) | A servo system and method for positioning a read/write transducer relative to a storage medium and a recording medium for use in such a system and method | |
KR19980069920A (en) | A magnetic disk stack having a laser bump identifier on a magnetic disk | |
US6822814B2 (en) | Write head collision detection using MR read element in disc drives | |
JP3721255B2 (en) | Magnetic information storage device | |
US6873492B2 (en) | Magnetic media with readable topographical features in combination with a slider-mounted non-magnetic transducer | |
US6426844B1 (en) | Method and apparatus for phase modulated servo positioning in a direct access storage device | |
WO1998016922A1 (en) | Disc drive servo system employing thermal signals | |
US5083226A (en) | Magnetic disk drive | |
JPH09305966A (en) | Magnetic disk and magnetic disk device | |
WO1998041981A1 (en) | Disc drive servo system employing thermal signals | |
US20030132747A1 (en) | Thermal decay test method of magnetic hard disk |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): DE GB JP KR SG |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
ENP | Entry into the national phase |
Ref document number: 1998 518464 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1019997003272 Country of ref document: KR |
|
RET | De translation (de og part 6b) |
Ref document number: 19782063 Country of ref document: DE Date of ref document: 19991014 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 19782063 Country of ref document: DE |
|
WWP | Wipo information: published in national office |
Ref document number: 1019997003272 Country of ref document: KR |
|
WWW | Wipo information: withdrawn in national office |
Ref document number: 1019997003272 Country of ref document: KR |