US5500848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sector servo data recording disk having data regions without identification (ID) fields
Assignee: HGST Netherlands BV
•
Filing: 1993-06-23
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Granted: 1996-03-19
•
Expires: 2013-06-23
Abstract
Abstract A data recording disk file with a fixed block architecture sector format that eliminates the ID region. The servo region contains sector identification information in the form of a start-of-track indicating mark recorded in a selected sector of each track and a start-of-sector indicating mark recorded in each sector. A full track number identifier is encoded in the position field within the servo region of each sector. A look-up table is built at format time to map bad sectors out of the disk file. The table contains entries for each cluster of contiguous bad sectors, and is searched at runtime to provide conversion of logical sector location identifiers to physical sector location identifiers.
Inventors
- 👤 John S. Best
- 👤 Steven R. Hetzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:45
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B20/12; G11B20/1217; G11B20/1252; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B2020/1218; G11B2020/1232; G11B2020/1234; G11B2020/1255; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
134 words
A data recording disk having a pattern of radially spaced tracks and a plurality of circumferentially spaced angular sectors having prerecorded servo positioning information for identifying track and sector locations, each of the plurality of sectors including only a data region for recording user data and, preceding the data region in the circumferential direction, a servo-and-recovery region which provides the prerecorded servo positioning information to uniquely identify the sector and track, wherein the servo-and-recovery region includes a write-to-read-recovery and speed-compensation field, an error handling field, a position-error-signal field, a start-of-sector indicating mark, and a track number field, but no data region identification (ID) field, wherein the data region includes, in sequence, a read-to-write-recovery and speed-compensation field and a synchronization field, and wherein one of the plurality of sectors also includes a start-of-track indicating mark.
Claim 2
Dependent Claim
134 words
A data recording disk having a pattern of radially spaced tracks and a plurality of circumferentially spaced angular sectors having prerecorded servo positioning information for identifying track and sector locations, each of the plurality of sectors including only a data region for recording user data and, preceding the data region in the circumferential direction, a servo-and-recovery region which provides the prerecorded servo positioning information to uniquely identify the sector and track, wherein the servo-and-recovery region includes a write-to-read-recovery and speed-compensation field, an error handling field, a position-error-signal field, a start-of-sector indicating mark, and a track number field, but no data region identification (ID) field, wherein the data region includes, in sequence, a read-to-write-recovery and speed-compensation field and a synchronization field, and wherein one of the plurality of sectors also includes a start-of-track indicating mark.
Claim 3
Dependent Claim
21 words
The data recording disk as recited in claim 1, wherein the track number field includes a full track number prerecorded therein.
Claim 4
Dependent Claim
21 words
The data recording disk as recited in claim 1, wherein the start-of-track indicating mark is encoded in the track number field.
Claim 5
Dependent Claim
37 words
The data recording disk as recited in claim 1, wherein the start-of-sector indicating mark is an address mark located in the servo-and-recovery region, and wherein the address mark precedes the track number field in the circumferential direction.
Claim 6
Dependent Claim
21 words
The data recording disk as recited in claim 1, wherein the track number field includes a full sector number prerecorded therein.
Claim 7
Dependent Claim
25 words
The data recording disk as recited in claim 1 wherein some of the tracks also have servo-and-recovery regions located within some of the data regions.
Claim 8
Dependent Claim
102 words
A data recording disk having a plurality of tracks, each of the plurality of tracks having a start-of-track indicating mark and being divided into a number of data regions for recording user data and a number of servo-and-recovery regions, the servo-and-recovery regions containing a position-error-signal field, a servo-and-recovery region count mark, and a track number field, at least one of the data regions being split by a servo-and-recovery region, and wherein none of the plurality of tracks have, either within or outside the data regions and servo-and-recovery regions, identification (ID) regions containing information that uniquely identifies the data regions in the tracks.
Claim 9
Dependent Claim
102 words
A data recording disk having a plurality of tracks, each of the plurality of tracks having a start-of-track indicating mark and being divided into a number of data regions for recording user data and a number of servo-and-recovery regions, the servo-and-recovery regions containing a position-error-signal field, a servo-and-recovery region count mark, and a track number field, at least one of the data regions being split by a servo-and-recovery region, and wherein none of the plurality of tracks have, either within or outside the data regions and servo-and-recovery regions, identification (ID) regions containing information that uniquely identifies the data regions in the tracks.
Claim 10
Dependent Claim
21 words
The data recording disk as recited in claim 7 wherein the track number field includes a full track number prerecorded therein.
Claim 11
Dependent Claim
22 words
The data recording disk as recited in claim 7 wherein the start-of-track indicating mark is located within one of the servo-and-recovery regions.
Claim 12
Dependent Claim
21 words
The data recording disk as recited in claim 9 wherein the start-of-track indicating mark is encoded in the track number field.
Claim 13
Dependent Claim
20 words
The data recording disk as recited in claim 7 wherein the servo-and-recovery region count mark is a start-of-servo-and-recovery region mark.
Claim 14
Dependent Claim
27 words
The data recording disk as recited in claim 11 wherein the start-of-servo-and-recovery region mark is an address mark that precedes the track number field in the track.
Claim 15
Dependent Claim
19 words
The data recording disk as recited in claim 11 wherein the start-of-servo-and-recovery region mark is a servo-and-recovery region number.
Claim 16
Dependent Claim
20 words
The data recording disk as recited in claim 7 wherein the servo-and-recovery regions include a write-to-read recovery and speed-compensation field.
Claim 17
Dependent Claim
26 words
The data recording disk as recited in claim 7 wherein the data regions include, in sequence, a read-to-write recovery and speed-compensation field and a synchronization field.
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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) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |