Disk drive implementing hysteresis for primary shock detector based on a more sensitive secondary shock detector
US8947819B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2013 |
| Grant date | Feb 3, 2015 |
| Priority date | — |
| Expiry date | Oct 15, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59694
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk, and control circuitry comprising a first shock detector and a second shock detector. A first number of shock events is detected based on the first shock detector, and when the first number of shock events exceeds an upper event threshold, a sensitivity of the first shock detector is decreased. After decreasing the sensitivity of the first shock detector, a second number of shock events is detected based on the second shock detector operating at a higher sensitivity than the first shock detector. When the second number of shock events falls below a lower event threshold, the sensitivity of the first shock detector is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.