Synchronous repeatable run out field detection with high efficiency field format
US7773328B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 16, 2008 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Feb 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hard disk control system comprises a phase adjust module, an offset adjust module, and a read/write timing module. The phase adjust module generates a phase adjust signal based on a phase difference between a first repeatable run out (RRO) field and a servo wedge field. The offset adjust module outputs a position calibration pattern to a storage medium based on the phase adjust signal; receives at least a portion of the position calibration pattern from the storage medium; and determines an offset based on a comparison between the output position calibration pattern and the received portion of the position calibration pattern. The read/write timing module determines a position to write a second RRO field on the storage medium based on the offset.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.