US4001883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density data storage on magnetic disk
Assignee: Bull HN Information Systems Inc
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Filing: 1974-03-07
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Granted: 1977-01-04
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Expires: 1994-03-07
Abstract
Abstract High density data storage is permitted on magnetic disk by providing uniform length data sectors and by grouping a plurality of data sectors with a single header. Any data sector may be accessed through location of the desired group header and counting to the position of the sector.
Inventors
- 👤 Frederick D. Strout
- 👤 Jaime Calle
- 👤 Edwin W. Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:10
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/326; G11B20/00; G11B20/10; G11B20/12; G11B20/1217; G11B20/1252; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2508
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
The method of high density storage of data in individually retrievable data sectors on a magnetic recording medium comprising the steps of magnetically recording a header for identifying a plurality of data sectors, magnetically recording after said header and in association therewith a plurality of uniform length data sectors each identifiable from said header and individually retrievable for read and record operations, and providing a gap before and after each data sector to facilitate said read and record operations of a data sector without affecting adjacent data sectors.
Claim 2
Independent Claim
88 words
The method of high density storage of data in individually retrievable data sectors on a magnetic recording medium comprising the steps of magnetically recording a header for identifying a plurality of data sectors, magnetically recording after said header and in association therewith a plurality of uniform length data sectors each identifiable from said header and individually retrievable for read and record operations, and providing a gap before and after each data sector to facilitate said read and record operations of a data sector without affecting adjacent data sectors.
Claim 3
Dependent Claim
20 words
The method defined by claim 1 wherein said gap includes a splice area, synchronization, and number identifying the following sector.
Claim 4
Dependent Claim
33 words
The method defined by claim 2 wherein said headers indicate track address and track condition and at least one header per track indicates an alternate track address if the track condition is defective.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |