Disk storage device
US6989957B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Jan 18, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08529
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive comprises a controller (70) that calculates a drive signal for positioning a head at a desired track on the basis of a desired track-position signal and a measured head-position signal, and a drive circuit for driving a voice-coil motor. The drive circuit includes a current feedback amplifier (21) and a voltage feedback amplifier (50), which can be selectively used. The controller (70) is provided with a speed limiter for determining a maximum speed limiting the speed of a head. The voltage feedback amplifier of the drive circuit is used when the head-position signal is unstable or otherwise malfunctioning, and the current feedback amplifier of the drive circuit is used when the head-position signal is normal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.