Disk drive compensating for cycle slip of disk locked clock when reading mini-wedge
US9025269B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 10, 2014 |
| Grant date | May 5, 2015 |
| Priority date | — |
| Expiry date | Jan 10, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59616
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by full sectors and intervening short servo sectors, where each full servo sector comprises a preamble, a sync mark, and servo bursts, and each short servo sector comprises a reference pattern and servo bursts. A first phase error is generated based on the sync mark in a first full servo sector, and a disk locked clock is adjusted in response to the first phase error. A second phase error is generated based on the reference pattern in a first short servo sector, and the second phase error is processed to determine whether the disk locked clock slipped a cycle before the head reaching the first short servo sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.