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US5440474A
Expired / Lapsed
US
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Magnetic recording disk with equally-spaced servo sectors extending across multiple data bands
Assignee: HGST Netherlands BV
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Filing: 1993-11-10
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Granted: 1995-08-08
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Expires: 2013-11-10
Abstract
Abstract A magnetic recording disk has servo sectors that are generally equally spaced on a given track and read during seek, settle, and track-following operations. An algorithm is used to determine the allowable time separation between servo sectors on a track and lengths of associated data sections that may be accommodated on the disk. In such a manner, the servo sectors are equally spaced on a given track and may be located within a data field of a data sector, within an identification region, or immediately after an address indicating mark (such as an address mark or an index mark). The rate at which the servo sectors are sampled is constant and independent of the number and lengths of the data sections. As a result of this independent relationship, this technique is suitable for a banded recording disk using sectored servo. The banded magnetic recording disk with multiple radially-spaced data bands has generally equally angularly-spaced servo sectors extending across the bands to provide a constant servo sample rate independent of the data rate.
Inventors
- 👤 Steven R. Hetzler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:47
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1217; G11B20/1258; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59633; G11B5/59655; G11B2020/1087; G11B2020/10879; G11B2020/10916; G11B2020/1257; G11B2020/1264; G11B2020/1265; G11B2020/1281; G11B2020/1282; G11B2220/00; G11B2220/20; G11B2220/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A magnetic recording disk, the magnetic recording surface of the disk being divided into a plurality of radially-spaced bands, each band comprising a plurality of concentric data tracks, all of the data tracks in each band being divided into the same number of data sectors, the number of data sectors in a data track of each band being different from the number of data sectors in a data track in the other band or bands, but each data sector in each band containing the same number of data bits, the magnetic recording surface also having formed on it a plurality of generally equally angularly-spaced servo sectors extending generally radially across the bands, wherein some of the servo sectors are located within some of the data sectors.
Claim 2
Dependent Claim
126 words
A magnetic recording disk, the magnetic recording surface of the disk being divided into a plurality of radially-spaced bands, each band comprising a plurality of concentric data tracks, all of the data tracks in each band being divided into the same number of data sectors, the number of data sectors in a data track of each band being different from the number of data sectors in a data track in the other band or bands, but each data sector in each band containing the same number of data bits, the magnetic recording surface also having formed on it a plurality of generally equally angularly-spaced servo sectors extending generally radially across the bands, wherein some of the servo sectors are located within some of the data sectors.
Claim 3
Dependent Claim
33 words
The disk according to claim 1 wherein some of the servo sectors located within some of the data sectors split those data sectors into at least two portions of substantially different circumferential lengths.
Claim 4
Dependent Claim
139 words
A magnetic recording disk, the magnetic recording surface of the disk having (a) a plurality of radially-spaced bands, each band comprising a plurality of concentric data tracks: (b) a plurality of data sectors in each data track of each band, the number of data sectors per data track being the same for all data tracks in a band and different from the number of data sectors per data track in the other band or bands, but each data sector in each band containing the same number of data bits; and (c) a plurality of generally equally angularly-spaced servo sectors, each of the servo sectors extending generally radially across the bands with at least one of the servo sectors being located within one of the data sectors of one of the bands and splitting that data sector into multiple portions.
Claim 5
Dependent Claim
139 words
A magnetic recording disk, the magnetic recording surface of the disk having (a) a plurality of radially-spaced bands, each band comprising a plurality of concentric data tracks: (b) a plurality of data sectors in each data track of each band, the number of data sectors per data track being the same for all data tracks in a band and different from the number of data sectors per data track in the other band or bands, but each data sector in each band containing the same number of data bits; and (c) a plurality of generally equally angularly-spaced servo sectors, each of the servo sectors extending generally radially across the bands with at least one of the servo sectors being located within one of the data sectors of one of the bands and splitting that data sector into multiple portions.
Claim 6
Dependent Claim
54 words
The disk according to claim 3 wherein the magnetic recording surface of the disk also has (d) a radial index mark, the index mark being common to all the bands and extending across the bands in a generally radial direction, and wherein the first servo sector is located at the common radial index mark.
Claim 7
Dependent Claim
35 words
The disk according to claim 3 wherein at least one of the servo sectors located within one of the data sectors splits that data sector into at least two portions of substantially different circumferential lengths.
Claim 8
Dependent Claim
62 words
The disk according to claim 3 wherein if the number of data sectors within each band is represented by the variable M and the number of servo sectors is represented by the constant N, then the ratio of M to N for each band is equal to a ratio of two integers, each integer being within the range of 1 to 12.
References Cited (Backward Citations)
US3185972A
Cited
US4175270A
Cited
US3701846A
Cited
US4322759A
Cited
US3662353A
Cited
US4001883A
Cited
US3994016A
Cited
US4094013A
Cited
US4016603A
Cited
US4134138A
Cited
US4135217A
Cited
US4388655A
Cited
US4377827A
Cited
US4630140A
Cited
US4841498A
Cited
US4589037A
Cited
US4964009A
Cited
US4714967A
Cited
US4692821A
Cited
EP0278006A1
Cited
US4851933A
Cited
US4823212A
Cited
US4873679A
Cited
US4858034A
Cited
JPS6419567A
Cited
US5070421A
Cited
US4933786A
Cited
US5196970A
Cited
US5140683A
Cited
US5121280A
Cited
US5134601A
Cited
US5117408A
Cited
US5136439A
Cited
US5157670A
Cited
US5210660A
Cited
US5073834A
Cited
US5285327A
Cited
WO1992000589A1
Cited
US5170299A
Cited
US5255136A
Cited
JPH04155662A
Cited
US5305302A
Cited
US5241546A
Cited
US5258933A
Cited
US5260703A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-07 | 1999-02-06 | 1999-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-07 | 2003-02-06 | 2003-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-07 | 2007-02-06 | 2007-08-08 | $7700.00 | Window Closed / Lapsed |