Stable time domain radial self-servo write propagation
US7511913B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2006 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Jan 31, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the present invention provide an approach in the time domain, instead of the frequency domain, for analyzing and correcting for radial propagation instability in servo-writing. In one embodiment, a system for controlling a read/write head of a disk drive to correct propagation errors during self-servo writing on a disk comprises a time-domain based controller to provide closed-loop feedback control to an actuator for moving the read/write head, the controller including a state observer. The controller is configured to measure read head position information of the read/write head on the disk; provide the measured read head position information to the state observer which produces feedback variables for feedback control of the read/write head, the feedback variables being weighted by feedback gains which have been determined a prior; and apply the weighted feedback variables to provide the closed-loop feedback control to the actuator for moving the read/write head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.