Disk drive detecting microactuator degradation by evaluating frequency component of servo signal
US8929022B1 · kind B1 · utility
2Cited by
326References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2012 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Dec 19, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising, a head, a disk surface, and a dual stage actuator (DSA) servo loop comprising a voice coil motor (VCM) servo loop comprising a VCM and a microactuator servo loop comprising a microactuator operable to actuate the head over the disk surface. A frequency component of a servo signal in the DSA servo loop is evaluated, wherein the frequency component is based on a peak frequency of an error rejection curve of the DSA servo loop. A degradation of the microactuator is detected based on the frequency component of the servo signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.