Disk drive adjusting digital phase locked loop over sector data with frequency induced phase error measured over preamble
US8780470B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2013 |
| Grant date | Jul 15, 2014 |
| Priority date | — |
| Expiry date | Mar 11, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/1024
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a head actuated over a disk comprising a sector including a periodic pattern and sector data. The sector is read with the head to generate a read signal which is sampled at a sampling frequency with a signal sampler to generate signal samples. The signal samples representing the periodic pattern are processed to measure a frequency induced phase error based on kδ where k represents a signal sample index and δ is a fraction of 2π. The signal samples representing the sector data are processed to generate a data phase error. The data phase error is adjusted in response to the frequency induced phase error to generate an adjusted data phase error, and the signal sampler is controlled in response to the adjusted data phase error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.