US4839879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording data on non-defective sectors of an optical disk
Assignee: Panasonic System Solutions Japan Co Ltd
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Filing: 1987-08-27
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Granted: 1989-06-13
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Expires: 2007-08-27
Abstract
Abstract An optical disc is subdivided into a plurality of concentric tracks. The tracks are further subdivided into a plurality of sectors. A method for recording data on such an optical disc includes the steps of designating some of the sectors as preliminary sectors and the remaining sectors as user sectors, identifying defective user sectors, and recording data corresponding to the defective sectors on the preliminary sectors.
Inventors
- 👤 Kaname Sawada
- 👤 Kazuo Suzuki
- 👤 Shinji Hasunuma
- 👤 Eizo Katayama
- 👤 Motoyasu Ohno
- 👤 Tsukasa Kanazawa
- 👤 Keiji Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:52
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1883; G11B7/00; G11B7/004; G11B7/0045; G11B2020/10916; G11B2020/1893; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
97 words
A method of recording data on an optical disc, said optical disc having a plurality of concentric tracks, each of said tracks being subdivided into a plurality of sectors, said method comprising the steps of: designating, for each of said tracks, at least one of said sectors as preliminary sectors and designating the remaining sectors as user sectors; recording basic data on said user sectors; reproducing data from said user sectors; comparing said basic data with said reproduced data to thereby identify defective user sectors; recording data corresponding to said defective user sectors on said preliminary sectors.
Claim 2
Independent Claim
97 words
A method of recording data on an optical disc, said optical disc having a plurality of concentric tracks, each of said tracks being subdivided into a plurality of sectors, said method comprising the steps of: designating, for each of said tracks, at least one of said sectors as preliminary sectors and designating the remaining sectors as user sectors; recording basic data on said user sectors; reproducing data from said user sectors; comparing said basic data with said reproduced data to thereby identify defective user sectors; recording data corresponding to said defective user sectors on said preliminary sectors.
Claim 3
Dependent Claim
44 words
A method of recording data on an optical disc as claimed in claim 1, further comprising the step of identifying a leading sector of user sectors of a first track during said step of recording data on said preliminary sectors of a second track.
References Cited (Backward Citations)
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |