Magnetic disk device and read/write method
US7486461B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2005 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Nov 28, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59627
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Embodiments of the invention eliminate the unnecessary disk format margin to raise the format efficiency. In one embodiment, a disk control unit (MPU) predicts the variation of the next servo sector pulse interval based on each learnt servo sector pulse interval. From this predicted interval, an optimal variation of the data sector pulse interval is determined for the current servo sector pulse. This optimal variation is set to an internal register of the hard disk controller (HDC). Based on this set variation, an internal calculation circuit calculates a corrected data sector pulse interval. Thus, data sector pulses are output at intervals optimized on an individual servo sector basis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.