Patent US4656532A successfully refreshed from Google Patents.
US4656532A
Expired / Lapsed
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Sector identification method for hard sectored hard files
Assignee: International Business Machines Corp
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Filing: 1985-07-29
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Granted: 1987-04-07
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Expires: 2005-07-29
Abstract
Abstract A disk file control provides for tracks having defective sectors by forming sectors as a single, uninterrupted stream of serial data containing both identifier (ID) and data portions. Reading a single ID portion characterizes the entire track to permit writing data without a separate revolution to read the ID field. The ID information includes the offset of the first logical sector on the track and the locations of defective sectors that must be skipped. As soon as one ID is read, the location of the addressed sector is ascertained and the ID data for the sector to be written is formulated so that the entire sector including both ID and data can be written when the sector first approaches the transducer. If alternate sectors are permitted on a subsequent track under the strategy being used, a single ID on the track will define where the logical sectors making up that track will appear (either the physical sector location on the track or at an alternate location on the next track).
Inventors
- 👤 Richard Greenberg
- 👤 David A. Styczinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:51
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B20/12; G11B20/1217; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B2020/1218; G11B2020/1232; G11B2020/1234; G11B2020/1255; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2508
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
187 words
In a data storage device with multiple media surfaces that rotate in unison and a plurality of transducers carried by an actuator to enable movement in unison and alignment with concentric data tracks on said media surfaces permitting each transducer to be in a read/write relationship with one of a series of tracks, whereby at a given location the tracks confronting said plurality of transducers form a cylinder and wherein each of said data tracks are divided into a plurality of sequential sectors, each comprising an identifier portion and a data portion wherein said identifier portion includes a track ID, that identifies the cylinder and head; the actual sector number, the sequential number of the sector on the track; a displacement value, that specifies the number of sectors the logical sector has been displaced due to skipped defective sectors on previous tracks and/or spare sectors; and a defective sector list of sector numbers on the track which are to be skipped; whereby the identifier portion of each sector provides the information as to the position of a plurality of the next subsequent logical sectors on the track.
Claim 2
Dependent Claim
187 words
In a data storage device with multiple media surfaces that rotate in unison and a plurality of transducers carried by an actuator to enable movement in unison and alignment with concentric data tracks on said media surfaces permitting each transducer to be in a read/write relationship with one of a series of tracks, whereby at a given location the tracks confronting said plurality of transducers form a cylinder and wherein each of said data tracks are divided into a plurality of sequential sectors, each comprising an identifier portion and a data portion wherein said identifier portion includes a track ID, that identifies the cylinder and head; the actual sector number, the sequential number of the sector on the track; a displacement value, that specifies the number of sectors the logical sector has been displaced due to skipped defective sectors on previous tracks and/or spare sectors; and a defective sector list of sector numbers on the track which are to be skipped; whereby the identifier portion of each sector provides the information as to the position of a plurality of the next subsequent logical sectors on the track.
Claim 3
Dependent Claim
48 words
The data storage device of claim 1 wherein said defective sector list contains an identification of all the sectors on the track that are to be skipped, whereby the identifier portion of each sector provides the information as to the position of every logical sector on the track.
Claim 4
Dependent Claim
28 words
The data storage device of claim 1 wherein the identifier portion and the data portion of each sector are recorded as a single consecutive sequence of data bits.
Claim 5
Dependent Claim
36 words
The data storage device of claim 3 wherein said sector data portion further includes an error correction field that corrects errors in the consecutive sequence of bits that form the combined identifier and data sector portions.
Claim 6
Dependent Claim
25 words
The data storage device of claim 4 wherein said sector identifier portion further includes flag bits for recording the data condition of the associated sector.
Claim 7
Independent Claim
138 words
The method of storing data in a storage device having multiple media surfaces that rotate in unison and a plurality of transducers carried by an actuator for movement in unison into read/write alignment with respective data tracks on said media, wherein the data tracks accessed by said transducers when said actuator is at a given position form a cylinder, comprising reading an ID field, including the present sector identification and the identity of bad sectors to be skipped; calculating the physical location of the sector addressed; formulating the identifier information to be written into the addressed sector ID field; counting sectors until the addressed sector is the next sector on the track; and synchronizing with the addressed sector sync field and writing the ID and data portions of the sector as a continuous, uninterrupted sequence of serial data.
Claim 8
Independent Claim
138 words
The method of storing data in a storage device having multiple media surfaces that rotate in unison and a plurality of transducers carried by an actuator for movement in unison into read/write alignment with respective data tracks on said media, wherein the data tracks accessed by said transducers when said actuator is at a given position form a cylinder, comprising reading an ID field, including the present sector identification and the identity of bad sectors to be skipped; calculating the physical location of the sector addressed; formulating the identifier information to be written into the addressed sector ID field; counting sectors until the addressed sector is the next sector on the track; and synchronizing with the addressed sector sync field and writing the ID and data portions of the sector as a continuous, uninterrupted sequence of serial data.
Claim 9
Dependent Claim
21 words
The method of claim 6 wherein said data recording is continued in consecutive good sectors until the write command is completed.
Claim 10
Dependent Claim
29 words
The method of claim 7 wherein the writing of said sequence of serial data includes an error correction code that extends to both the data and ID sector portions.
References Cited (Backward Citations)
US4507693A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |