Write clock phase tracking for magnetic recording device
US8760785B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2013 |
| Grant date | Jun 24, 2014 |
| Priority date | — |
| Expiry date | Aug 9, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0026
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Synchronization technologies for disk drives are described. A described technique includes receiving a waveform produced by a read head operated with respect to a recording medium including magnetic data positions, a first servo sync mark (SSM), a second SSM, and phase tracking fields (PTFs); producing, based on the waveform, a servo detect pulse that indicates a detection of at least one of the SSMs; controlling a first adjustment of a phase of a write clock signal, the first adjustment being responsive to the servo detect pulse; producing, based on the write clock signal, samples of the waveform that correspond to the PTFs; and controlling second adjustments of the phase based on the samples to align the write clock signal with at least a portion of the data positions, the second adjustments being responsive to the PTFs, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.