Linear recording executing optimum writing upon receipt of series of commands including mixed read and write commands
US9135949B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2014 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Dec 10, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/93
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method is provided according to one embodiment, which executes an optimum writing method even when overwrite is intervened between mixed read and write operations. In response to receiving an overwrite command while executing the mixed operations, which writes to a predetermined tape position, when a tape position to overwrite on is encountered before the append-written data ending position of the tape (tape EOD), the overwritten tape position is regarded as the append-written data ending position of the tape (tape EOD) to update the tape EOD by the overwritten tape position. When a tape position to overwrite is encountered after the append-written data ending position of the tape (tape EOD), the overwritten tape position is updated by the append-written data ending position of a non-volatile memory (non-volatile EOD). The updating the EODs enhances the performance of the mixed read and write operations even when an overwrite command is intervening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.