Rapid off track detection using in-drive microactuator
US7602577B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2006 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Aug 19, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microactuator incorporated within an actuator assembly of a disk drive is used as a detection element for rapid off track events that may occur. Preferably, the microactuator employs one or more piezoelectric elements used for purposes of secondary actuation. Uncontrolled movement of the actuator across the disk results in the piezoelectric elements generating a voltage spike or signal that is analyzed to determine whether a rapid off track event has occurred. Rapid off track events are distinguished from other possible events, such as shock events. If a rapid off track event is detected, then remedial actions are taken to restore data integrity, to include executing restore commands such as rewriting selected data tracks. Dedicated piezoelectric elements may also be provided for detecting rapid off track events wherein these elements are not incorporated in the servo loop that controls positioning of the actuator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.