System for write once read many optical storage devices to appear rewritable
US5218685A · kind A · utility
40Cited by
18References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 16, 1988 |
| Grant date | Jun 8, 1993 |
| Priority date | — |
| Expiry date | Sep 16, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0866
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for Write Once Read Many (WORM) optical storage devices to appear rewritable uses magnetic disk storage and optical WORM storage subsystem. All new write operations are made to a magnetic cache storage which resides on the magnetic disk subsystem. A Least Recently Written (LRW) technique is used to determine which valid data in cache storage is the oldest and must be transfered to optical storage to make room for new data. In this manner all new write operations are performed to the magnetic cache storage and only the oldest valid data is transferred to optical disk, optimizing its use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.