Disk drive having internal data structures for efficiently storing repeatable runout cancellation information
US6972922B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2003 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Sep 7, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive includes a sampled servo controller for periodically adjusting a control effort signal during a track-following operation based on embedded distributed position information and repeatable runout (RRO) cancellation values for reducing effects of RRO in the distributed position information during track following. A magnetic disk in the disk drive stores RRO information relating to predetermined RRO cancellation values for a data storage track. The RRO information for the data storage track includes at least one first data structure having a first predetermined number of data bits for representing an initial RRO cancellation value, and includes at least one second data structure having a second predetermined number of data bits associated with a respective subsequent RRO cancellation value. The first predetermined number of data bits is greater than the second predetermined number of data bits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.