Disk drive having improved runout-error compensation, and method therefor
US6504668B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 10, 1999 |
| Grant date | Jan 7, 2003 |
| Priority date | — |
| Expiry date | May 10, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive has a servo controller that compensates for repeatable runout between the drive's data-transducing head and a data-storage disk disposed within the drive. The drive incorporates an improved runout-compensation technique by which a runout-error correction is applied to a plurality of locations on the disk without a need to store position-error data corresponding to each location. The drive also incorporates an improved runout-compensation technique by which the runout-error correction is optimally matched to the response characteristics of the drive's actuator mechanism. This optimal matching is accomplished by setting the anticipation interval for the correction in non-whole-sector increments, and calculating a to-be applied runout-error correction. Alternatively, the drive is equipped with a digital filter that calculates a runout-error correction based on a model of the actuator mechanism incorporated into the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.