US5583842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving servo field yields
Assignee: HSP (BVI) NOMINEES Ltd
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Filing: 1993-09-01
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Granted: 1996-12-10
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Expires: 2013-09-01
Abstract
Abstract A novel method is used to remap tracks on a disk that contain a defect in a servo field so that a large seek discontinuity is not encountered. The method is applicable to both Class 2 and Class 3 defects. When a track with a Class 2 defect or adjacent tracks with a Class 3 defect are encountered, the tracks are skipped over in assigning physical track numbers to absolute track numbers. When a first defective track is encountered, the next track without a defect is assigned the physical track number that would have been assigned to the first defective track. As the remapping operation continues, each subsequent track with a Class 2 defect or adjacent tracks with a Class 3 defect is handled in a similar manner. The remapping operation is terminated when the number of mapped tracks is equal to the desired number of physical tracks n.
Inventors
- 👤 Brian D. Wilson
- 👤 Bruce D. Emo
- 👤 Patricia M. Vincent
- 👤 Wayne T. Weber, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:57
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B2020/10916; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
141 words
A method for mapping physical track numbers to concentric tracks on a disk having a defect in track (m+1) comprising the steps of: formatting said concentric tracks consecutively in a radial direction of said disk from absolute track number 0 to absolute track number x wherein track (m+1) is absolute track number (m+1) and is located between said absolute track number 0 and absolute track number x; mapping physical track numbers 0 to m to absolute track numbers 0 to m respectively; skipping absolute track number (m+1) which contains said defect by not assigning a physical track number to absolute track number (m+1); ;and mapping physical track number (m+1) to absolute track number (m+2) wherein only a single altered seek from physical track number m to physical track number m+1 is required in avoiding the defect in absolute track number (m+1).
Claim 2
Independent Claim
141 words
A method for mapping physical track numbers to concentric tracks on a disk having a defect in track (m+1) comprising the steps of: formatting said concentric tracks consecutively in a radial direction of said disk from absolute track number 0 to absolute track number x wherein track (m+1) is absolute track number (m+1) and is located between said absolute track number 0 and absolute track number x; mapping physical track numbers 0 to m to absolute track numbers 0 to m respectively; skipping absolute track number (m+1) which contains said defect by not assigning a physical track number to absolute track number (m+1); ;and mapping physical track number (m+1) to absolute track number (m+2) wherein only a single altered seek from physical track number m to physical track number m+1 is required in avoiding the defect in absolute track number (m+1).
Claim 3
Independent Claim
159 words
A method for mapping physical track numbers to concentric tracks on a disk having a defect in tracks (m+1) and (m+2) comprising the steps of: formatting said concentric tracks consecutively in a radial direction of said disk from absolute track number 0 to absolute track number x wherein track (m+1) is absolute track number (m+1); track (m+2) is absolute track number (m+2); and tracks (m+1) and (m+2) are located between absolute track number 0 and absolute track number x; mapping physical track numbers 0 to m to absolute track numbers 0 to m respectively; skipping absolute track numbers (m+1) and (m+2) which contain said defects by not assigning a physical track number to absolute track numbers (m+1) and (m+2); and mapping physical track number (m+1) to absolute track number (m+3) wherein only a single altered seek from physical track number m to physical track number (m+1) is required in avoiding the defects in absolute track numbers (m+1) and (m+2).
Claim 4
Independent Claim
159 words
A method for mapping physical track numbers to concentric tracks on a disk having a defect in tracks (m+1) and (m+2) comprising the steps of: formatting said concentric tracks consecutively in a radial direction of said disk from absolute track number 0 to absolute track number x wherein track (m+1) is absolute track number (m+1); track (m+2) is absolute track number (m+2); and tracks (m+1) and (m+2) are located between absolute track number 0 and absolute track number x; mapping physical track numbers 0 to m to absolute track numbers 0 to m respectively; skipping absolute track numbers (m+1) and (m+2) which contain said defects by not assigning a physical track number to absolute track numbers (m+1) and (m+2); and mapping physical track number (m+1) to absolute track number (m+3) wherein only a single altered seek from physical track number m to physical track number (m+1) is required in avoiding the defects in absolute track numbers (m+1) and (m+2).
Claim 5
Independent Claim
93 words
A method for mapping physical track numbers to concentric tracks, herein after "tracks," on a disk where one or more of the tracks include a defect, said method comprising: a) sequentially assigning a physical track number to each of the tracks until a defective track is found; b) skipping said defective track and any other defective tracks physically adjacent to said defective track by not assigning a physical track number to the defective track or tracks; and c) assigning a physical track number to the first track following said defective track or tracks.
Claim 6
Independent Claim
93 words
A method for mapping physical track numbers to concentric tracks, herein after "tracks," on a disk where one or more of the tracks include a defect, said method comprising: a) sequentially assigning a physical track number to each of the tracks until a defective track is found; b) skipping said defective track and any other defective tracks physically adjacent to said defective track by not assigning a physical track number to the defective track or tracks; and c) assigning a physical track number to the first track following said defective track or tracks.
Claim 7
Dependent Claim
35 words
The method of claim 3 wherein step c) further comprising assigning a physical track number to each track following the first track following said defective track or tracks until yet another defective track is found.
Claim 8
Dependent Claim
25 words
The method of claim 4 further comprising step d) of returning to step b) when said yet another defective track is found in step c.
Claim 9
Dependent Claim
20 words
The method of claim 5 further comprising repeating steps b), c), and d) until all physical track numbers are mapped.
Claim 10
Dependent Claim
23 words
The method of claim 3 wherein said step c) includes assigning a skew to said first track following said defective track or tracks.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-12-10 | 2000-06-10 | 2000-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-12-10 | 2004-06-10 | 2004-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-12-10 | 2008-06-10 | 2008-12-10 | $7700.00 | Window Closed / Lapsed |