Disk drive detecting touchdown event by evaluating frequency response of a touchdown metric
US8699173B1 · kind B1 · utility
99Cited by
12References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 1, 2011 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Jun 11, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/6076
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk, and a fly height actuator operable to control a fly height of the head over the disk. A periodic control signal is applied to the fly height actuator, a frequency response of a touchdown metric at a frequency of the periodic control signal is measured, and a touchdown event is detected in response to the frequency response of the touchdown metric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.