JP4854041B2 - 磁気ディスク装置、および磁気ディスクのアクセス制御方法 - Google Patents
磁気ディスク装置、および磁気ディスクのアクセス制御方法 Download PDFInfo
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- JP4854041B2 JP4854041B2 JP2008189536A JP2008189536A JP4854041B2 JP 4854041 B2 JP4854041 B2 JP 4854041B2 JP 2008189536 A JP2008189536 A JP 2008189536A JP 2008189536 A JP2008189536 A JP 2008189536A JP 4854041 B2 JP4854041 B2 JP 4854041B2
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- Prior art keywords
- magnetic
- area
- data recording
- servo
- magnetic disk
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- 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
- G11B5/59688—Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
-
- 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
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/743—Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
-
- 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
- G11B5/743—Patterned record carriers, wherein the magnetic recording layer is patterned into magnetic isolated data islands, e.g. discrete tracks
- G11B5/746—Bit Patterned record carriers, wherein each magnetic isolated data island corresponds to a bit
-
- 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
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/855—Coating only part of a support with a magnetic layer
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Nanotechnology (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Description
D データ記録領域
S サーボパターン領域
1 磁気ディスク
2 磁気ヘッド
10 非磁性領域
11,11’ 磁性部
60 サーボ再生信号生成部(サーボ再生信号生成手段)
61 波形極性検出部(絶対値化回路)
62 絶対値化波形生成部(絶対値化回路)
63 磁気ヘッド制御部(磁気ヘッド制御手段)
Claims (3)
- 非磁性領域内に磁性部が点在するデータ記録領域と、このデータ記録領域の磁性部よりも面積大で、かつ、磁化方向が一定方向に揃うようにあらかじめ着磁された複数の磁性部を含むサーボパターン領域とを有する磁気ディスクと、
上記磁気ディスクの径方向に往復移動可能とされ、上記データ記録領域の磁性部に磁化方向を付与するとともに、このデータ記録領域と上記サーボパターン領域における磁性部の磁化方向を読み取る磁気ヘッドと、
上記データ記録領域に対する記録あるいは再生に先立ち、上記磁気ヘッドで上記サーボパターン領域を絶対値化回路を通して読み取りサーボ再生信号を生成するサーボ再生信号生成手段と、
上記サーボ再生信号に基づいて上記磁気ヘッドを制御することにより、上記データ記録領域に対する記録あるいは再生を行う磁気ヘッド制御手段と、
を有することを特徴とする、磁気ディスク装置。 - 上記絶対値化回路は、上記サーボパターン領域からの読み取り信号における正常磁化波形および反転磁化波形を所定の閾値に基づき方形波信号に変換して出力するとともに、上記サーボパターン領域からの読み取り信号を微分した信号と上記方形波信号に基づいて上記サーボ再生信号を生成する、請求項1に記載の磁気ディスク装置。
- 非磁性領域内に磁性部が点在するデータ記録領域と、このデータ記録領域の磁性部よりも面積大で、かつ、磁化方向が一定方向に揃うようにあらかじめ着磁された複数の磁性部を含むサーボパターン領域とを有する磁気ディスクと、上記磁気ディスクの径方向に往復移動可能とされ、上記データ記録領域の磁性部に磁化方向を付与するとともに、このデータ記録領域と上記サーボパターン領域における磁性部の磁化方向を読み取る磁気ヘッドとを備えた磁気ディスク装置において、上記データ記録領域に対する記録あるいは再生に先立ち、上記磁気ヘッドで上記サーボパターン領域を読み取るための磁気ディスクのアクセス制御方法であって、
上記磁気ヘッドで上記サーボパターン領域を読み取り、そのサーボパターン領域を絶対値化回路を通して読み取りサーボ再生信号を生成するサーボ再生信号生成手順と、
上記サーボ再生信号に基づいて上記磁気ヘッドを制御することにより、上記データ記録領域に対する記録あるいは再生を行う磁気ヘッド制御手順と、
を実行することを特徴とする、磁気ディスクのアクセス制御方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008189536A JP4854041B2 (ja) | 2008-07-23 | 2008-07-23 | 磁気ディスク装置、および磁気ディスクのアクセス制御方法 |
US12/479,397 US7859779B2 (en) | 2008-07-23 | 2009-06-05 | Magnetic disk apparatus and magnetic disk access controlling method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008189536A JP4854041B2 (ja) | 2008-07-23 | 2008-07-23 | 磁気ディスク装置、および磁気ディスクのアクセス制御方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2010027170A JP2010027170A (ja) | 2010-02-04 |
JP4854041B2 true JP4854041B2 (ja) | 2012-01-11 |
Family
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JP2008189536A Expired - Fee Related JP4854041B2 (ja) | 2008-07-23 | 2008-07-23 | 磁気ディスク装置、および磁気ディスクのアクセス制御方法 |
Country Status (2)
Country | Link |
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US (1) | US7859779B2 (ja) |
JP (1) | JP4854041B2 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8995073B1 (en) * | 2013-03-14 | 2015-03-31 | Seagate Technology Llc | Data storage mediums and devices having bit patterned media |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63149884A (ja) | 1986-12-12 | 1988-06-22 | Nec Corp | 磁気ヘツドの位置決め回路 |
JP2003157507A (ja) | 2001-11-16 | 2003-05-30 | Fuji Electric Co Ltd | 磁気記録媒体、ディスク状磁気記録媒体の記録再生方法、記録装置 |
JP2004110896A (ja) | 2002-09-17 | 2004-04-08 | Tdk Corp | 垂直磁気記録再生システム |
JP2006031859A (ja) | 2004-07-16 | 2006-02-02 | Toshiba Corp | サーボ情報回復機能を有する磁気ディスクドライブ及び同ドライブにおけるサーボ情報回復方法 |
JP2006066006A (ja) * | 2004-08-30 | 2006-03-09 | Tdk Corp | 磁気記録媒体におけるサーボ信号の再生出力低下防止方法、rom、磁気記録再生装置 |
JP4473828B2 (ja) | 2006-02-24 | 2010-06-02 | 東芝ストレージデバイス株式会社 | 磁気ディスクのフォーマット方法 |
JP4185953B2 (ja) * | 2007-01-13 | 2008-11-26 | Tdk株式会社 | 磁気記録媒体、記録再生装置および磁気記録媒体製造用スタンパー |
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2008
- 2008-07-23 JP JP2008189536A patent/JP4854041B2/ja not_active Expired - Fee Related
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2009
- 2009-06-05 US US12/479,397 patent/US7859779B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US7859779B2 (en) | 2010-12-28 |
US20100020436A1 (en) | 2010-01-28 |
JP2010027170A (ja) | 2010-02-04 |
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