US5360651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk having R/W and worm area
Assignee: International Business Machines Corp
•
Filing: 1992-04-21
•
Granted: 1994-11-01
•
Expires: 2012-04-21
Abstract
Abstract An optical storage arrangement is provided where a unified optical disk, or other optical media, has separate Read/Write (R/W) and Write Once Read Many (WORM) areas. A Read/Write head or transducer selectively records data only once in the WORM area but records and re-records data in the R/W area. Both areas can be selectively read repetitively. The WORM area is used to store data records and the R/W area contains directories for the data records recorded in the WORM area.
Inventors
- 👤 Duane W. Baxter
- 👤 Leon E. Gregg
- 👤 William Jaaskelainen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/007; G11B7/0079; G11B7/24; G11B7/2403; G11B7/24035; G11B7/24038; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
An optical record medium on which data is to be recorded comprising: a first data recording surface having characteristics enabling selective dynamic optical recording of data non-ablatively whereby data can be written dynamically at one time and rewritten dynamically at another time, and second and third data recording surfaces having characteristics enabling selective dynamic optical recording of data ablatively whereby data can be written once dynamically at selected positions.
Claim 2
Dependent Claim
69 words
An optical record medium on which data is to be recorded comprising: a first data recording surface having characteristics enabling selective dynamic optical recording of data non-ablatively whereby data can be written dynamically at one time and rewritten dynamically at another time, and second and third data recording surfaces having characteristics enabling selective dynamic optical recording of data ablatively whereby data can be written once dynamically at selected positions.
Claim 3
Dependent Claim
14 words
The optical record medium of claim 1 where the record medium is a disk.
Claim 4
Dependent Claim
20 words
The optical record medium of claim 2 wherein said data recording surfaces are on the same side of said disk.
Claim 5
Dependent Claim
43 words
The optical record medium of claim 1 wherein: said second and third data recording surfaces having characteristics enabling optical recording of data ablatively to record permanently, and said first data recording surface having characteristics enabling recording of data non-ablatively to record data rewriteably.
Claim 6
Dependent Claim
32 words
The optical record medium of claim 1 wherein said data to be written dynamically at one time and dynamically re-written at another time is directory date for said data written once dynamically.
Claim 7
Dependent Claim
15 words
The optical record medium of claim 5 where said data written once dynamically are files.
Claim 8
Dependent Claim
13 words
The optical record medium of claim 6 where said files have file headers.
Claim 9
Dependent Claim
33 words
The optical record medium of claim 1 where said first, second and third data recording surfaces are disposed concentrically and with said first recording surface disposed between said second and third recording surfaces.
References Cited (Backward Citations)
JPS58114343A
Cited
JPS5971144A
Cited
GB2157035A
Cited
US4575827A
Cited
JPS60263353A
Cited
US4891305A
Cited
JPS62250532A
Cited
JPS62298982A
Cited
EP0355620A2
Cited
US5206003A
Cited
JPH03256244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |