Disk drive employing off-line scan to collect selection-control data for subsequently deciding whether to verify after write
US6289484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 1999 |
| Grant date | Sep 11, 2001 |
| Priority date | — |
| Expiry date | May 19, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive that includes a disk defining a multiplicity of sectors operates in accord with a method comprising the steps of providing a firmware-controlled state machine which can be in any of a plurality of states including an off-line in-progress state. While the state machine is in the off-line in progress state; a firmware-controlled scan of the multiplicity of sectors is performed. While performing the firmware-controlled scan, steps are performed to maintain a list of sector identifiers such that each sector identifier in the list points to a sector that has failed, preferably repeatedly, to provide valid data on the fly. While the state machine is not in the offline in-progress state; the drive responds to a request to write data at a specified sector by determining whether the specified sector matches a sector identifier in the list, and if so, autonomously performing a read-verify-after-write operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.