Reader instability detection and recovery
US11133032B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2020 |
| Grant date | Sep 28, 2021 |
| Priority date | — |
| Expiry date | Oct 20, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10388
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method includes detecting a read error during a first read operation by a read sensor on a first track on a data storage medium. The method also includes, after the read error is detected, performing a second read operation by the read sensor on the first track, carrying out bit error value (BEV) measurements for the second read operation, and determining, from the BEV measurements, whether the read sensor produces a marginal BEV, which is between first and second predetermined BEV thresholds. In response to determining that the read sensor produces the marginal BEV, a third read operation by the read sensor on the first track is carried out, and BEV measurements for the third read operation are performed. When the BEV measurements from the second and third read operations meet at least one predetermined read sensor instability criterion, it is concluded that the read sensor is unstable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.