Disk drive predicting off-track error due to disturbances occurring over different frequency ranges
US8767332B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2013 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Apr 3, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59688
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a disk, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk. A vibration signal VS(k) is measured representing a disturbance in the servo control system. A first future value of the vibration signal VS(k) is predicted based on:VS1(k+1)=α1[VS(k)−VS(k−1)]+VS(k)where α1 is a first scalar corresponding to a first frequency range. A second future value of the vibration signal VS(k) is predicted based on:VS2(k+1)=α2[VS(k)−VS(k−1)]+VS(k)where α2 is a second scalar corresponding to a second frequency range different from the first frequency range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.