Disk drive detecting crack in microactuator
US8335049B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2010 |
| Grant date | Dec 18, 2012 |
| Priority date | — |
| Expiry date | Apr 29, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5552
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a first disk surface, a first head coupled to a distal end of an actuator arm, and a voice coil motor (VCM) and a first microactuator operable to actuate the first head over the first disk surface. A servo loop for servoing the head in response to the servo sectors is disabled, and after disabling the servo loop, the first microactuator is excited with a control signal at a test frequency in order to accentuate a crack in the first microactuator. After exciting the first microactuator, the servo loop is enabled, and after enabling the servo loop, the first microactuator is evaluated to detect the crack in the first microactuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.