Position signal distortion compensation during a disc drive seek
US6538835B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1999 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Nov 4, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/5547
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for compensating for position signal distortion during a disc drive seek. A disc drive has first and second data recording surfaces on which tracks are defined, a moveable actuator which supports first and second magneto-resistive heads, and a servo circuit which applies current to an actuator motor to position the heads. During a seek in which the first head is moved from an initial track to a first destination track, upon loss of transduced servo data from the first data recording surface indicative of radial position of the head, the servo circuit switches from the first head to the second head and applies current to the actuator motor to move the second head to a known radial position with respect to the first destination track while transducing servo data from the second data recording surface. The servo circuit subsequently switches back to the first head to position the first head over the first destination track.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.