Serial data storage system with automatically adjusted data protection to implement worm media with limited overwrite allowing write appending
US6779080B2 · kind B2 · utility
33Cited by
15References
50Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2001 |
| Grant date | Aug 17, 2004 |
| Priority date | — |
| Expiry date | Apr 10, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a data storage subsystem, drive-level processing treats data storage media as WORM by automatically advancing a write append limiter as data is written, and preventing changes to data occurring before the write append limiter. Despite this media's WORM nature, the drive-level processing permits limited overwriting of data at the end of tape since the write append limiter lags the current write location by the margin of a write allowance index. Thus, despite the drive's treatment of the media as WORM, the drive permits overwriting of trailing metadata in order to facilitate write append operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.