CA2765148C - Control method and apparatus for a dual-channel weighted lpos combining scheme - Google Patents
Control method and apparatus for a dual-channel weighted lpos combining scheme Download PDFInfo
- Publication number
- CA2765148C CA2765148C CA2765148A CA2765148A CA2765148C CA 2765148 C CA2765148 C CA 2765148C CA 2765148 A CA2765148 A CA 2765148A CA 2765148 A CA2765148 A CA 2765148A CA 2765148 C CA2765148 C CA 2765148C
- Authority
- CA
- Canada
- Prior art keywords
- servo
- channel
- servo channel
- fsm
- sensor
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- XVCUGNWRDDNCRD-UHFFFAOYSA-M lithium;1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-heptadecafluorooctane-1-sulfonate Chemical compound [Li+].[O-]S(=O)(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F XVCUGNWRDDNCRD-UHFFFAOYSA-M 0.000 claims abstract description 46
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 238000013500 data storage Methods 0.000 claims description 33
- 238000004891 communication Methods 0.000 claims description 8
- 108091006146 Channels Proteins 0.000 description 122
- 230000007704 transition Effects 0.000 description 23
- 238000001514 detection method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- LZDYZEGISBDSDP-UHFFFAOYSA-N 2-(1-ethylaziridin-1-ium-1-yl)ethanol Chemical compound OCC[N+]1(CC)CC1 LZDYZEGISBDSDP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
- G11B5/584—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 tapes
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/29—Structure or manufacture of unitary devices formed of plural heads for more than one track
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/500,490 US8331055B2 (en) | 2009-07-09 | 2009-07-09 | Control method and apparatus for a dual-channel weighted LPOS combining scheme |
| US12/500,490 | 2009-07-09 | ||
| PCT/EP2010/057678 WO2011003677A1 (en) | 2009-07-09 | 2010-06-02 | Control method and apparatus for a dual-channel weighted lpos combining scheme |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2765148A1 CA2765148A1 (en) | 2011-01-13 |
| CA2765148C true CA2765148C (en) | 2017-09-19 |
Family
ID=42342448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2765148A Active CA2765148C (en) | 2009-07-09 | 2010-06-02 | Control method and apparatus for a dual-channel weighted lpos combining scheme |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US8331055B2 (enExample) |
| JP (1) | JP5651173B2 (enExample) |
| CN (1) | CN102473419B (enExample) |
| CA (1) | CA2765148C (enExample) |
| DE (1) | DE112010002334B4 (enExample) |
| GB (1) | GB2484229B (enExample) |
| WO (1) | WO2011003677A1 (enExample) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8271857B2 (en) | 2008-05-13 | 2012-09-18 | International Business Machines Corporation | Correcting errors in longitudinal position (LPOS) words |
| US7961424B2 (en) * | 2009-10-30 | 2011-06-14 | International Business Machines Corporation | Multilevel pulse position modulation for efficient encoding of information into servo patterns |
| EP2583999A1 (en) * | 2011-10-20 | 2013-04-24 | Basell Poliolefine Italia S.r.l. | Polyolefin compositions |
| GB2501521A (en) | 2012-04-27 | 2013-10-30 | Ibm | Skew compensation in tape storage device |
| GB2525222A (en) | 2014-04-16 | 2015-10-21 | Ibm | Method and apparatus for operating a tape storage device |
| US11430481B2 (en) * | 2020-09-09 | 2022-08-30 | Marvell Asia Pte, Ltd. | Dual-surface self-servo-write for storage device |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0508366B1 (en) | 1991-04-12 | 1997-06-11 | Sharp Kabushiki Kaisha | Magnetic head positioning device |
| US5448430A (en) * | 1993-08-05 | 1995-09-05 | International Business Machines Corporation | Track following servo demodulation |
| US5909336A (en) * | 1997-02-18 | 1999-06-01 | Texas Instruments Incorporated | Position detection scheme for headerless disk controller |
| US5930065A (en) * | 1997-05-16 | 1999-07-27 | International Business Machines Corporation | Timing based servo longitudinal addressing |
| JP2001250346A (ja) * | 2000-03-06 | 2001-09-14 | Fujitsu Ltd | 磁気テープ装置 |
| US6724561B1 (en) * | 2000-06-28 | 2004-04-20 | Storage Technology Corporation | Apparatus and method for compensating for environmental effects on media |
| US6580581B1 (en) * | 2000-08-16 | 2003-06-17 | International Business Machines Corporation | Recovery of lateral position of a servo system with respect to longitudinal servo bands of a magnetic tape |
| US6791781B2 (en) * | 2001-07-17 | 2004-09-14 | International Business Machines Corporation | Method and apparatus for providing linear position (LPOS) estimations |
| JP3830088B2 (ja) * | 2001-11-29 | 2006-10-04 | 富士写真フイルム株式会社 | サーボ制御方法、磁気テープ、及び磁気テープ記録再生装置 |
| US7130140B1 (en) * | 2002-05-06 | 2006-10-31 | Storage Technology Corporation | Polarity encoded pattern for timing based servo |
| US6937413B2 (en) * | 2003-08-08 | 2005-08-30 | International Business Machines Corporation | Tape servo information with superimposed data information providing servo band identification |
| US6987633B2 (en) * | 2003-10-10 | 2006-01-17 | International Business Machines Corporation | Apparatus and method to read information from a tape storage medium |
| US6992857B2 (en) * | 2004-02-02 | 2006-01-31 | Hewlett-Packard Development Company, L.P. | Weighting servo signals for head positioning |
| US7196859B2 (en) * | 2004-07-09 | 2007-03-27 | Imation Corp. | Processing techniques for time-based servo patterns |
| US7280294B2 (en) * | 2004-11-30 | 2007-10-09 | International Business Machines Corporation | Tri-state servowriter driver with slow return to zero |
| US7245450B1 (en) * | 2006-01-26 | 2007-07-17 | International Business Machines Corporation | Synchronous servo channel for longitudinal position detection and position error signal generation in tape drive systems |
| US7433142B2 (en) * | 2006-02-01 | 2008-10-07 | International Business Machines Corporation | Using at least one servo channel to provide timing recovery and timing information to data channels |
| US7365929B2 (en) * | 2006-07-30 | 2008-04-29 | International Business Machines Corporation | Synchronous servo channel for tape drive systems |
| US7605992B2 (en) * | 2008-01-28 | 2009-10-20 | International Business Machines Corporation | Robust LPOS detection with predictor and bit verifier |
| US7903368B2 (en) * | 2008-02-01 | 2011-03-08 | International Business Machines Corporation | Tape cartridge having tape media with longitudinally shifted servo pattern for increased sampling rate |
| US7990644B2 (en) * | 2008-02-29 | 2011-08-02 | International Business Machines Corporation | Apparatus and method to decode linear position information encoded in a sequential information storage medium |
| US7924520B2 (en) * | 2008-10-01 | 2011-04-12 | Hewlett-Packard Development Company, L.P. | Method and apparatus for determining position of a storage medium |
| US7982988B2 (en) * | 2009-03-09 | 2011-07-19 | International Business Machines Corporation | Combining information from parallel servo channels |
| US7839599B2 (en) * | 2009-03-09 | 2010-11-23 | International Business Machines Corporation | Combining information from parallel servo channels |
-
2009
- 2009-07-09 US US12/500,490 patent/US8331055B2/en not_active Expired - Fee Related
-
2010
- 2010-06-02 CN CN201080030677.XA patent/CN102473419B/zh not_active Expired - Fee Related
- 2010-06-02 WO PCT/EP2010/057678 patent/WO2011003677A1/en not_active Ceased
- 2010-06-02 DE DE112010002334T patent/DE112010002334B4/de not_active Expired - Fee Related
- 2010-06-02 GB GB1200295.2A patent/GB2484229B/en active Active
- 2010-06-02 CA CA2765148A patent/CA2765148C/en active Active
- 2010-06-02 JP JP2012518849A patent/JP5651173B2/ja active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US8331055B2 (en) | 2012-12-11 |
| US20110007413A1 (en) | 2011-01-13 |
| GB2484229B (en) | 2016-09-07 |
| DE112010002334T5 (de) | 2012-08-02 |
| DE112010002334B4 (de) | 2012-12-13 |
| GB201200295D0 (en) | 2012-02-22 |
| CN102473419A (zh) | 2012-05-23 |
| WO2011003677A1 (en) | 2011-01-13 |
| JP2012532401A (ja) | 2012-12-13 |
| GB2484229A (en) | 2012-04-04 |
| CA2765148A1 (en) | 2011-01-13 |
| CN102473419B (zh) | 2015-07-22 |
| JP5651173B2 (ja) | 2015-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20150323 |