Write clock synchronization appartus for magnetic recording disk drives with patterned media
US8477445B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2012 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | Dec 5, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/252
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A write clock generator for use in writing data to a rotating patterned magnetic media disk is disclosed. The generator includes a magnetic read head for generating a succession of servo signals representative of succession of servo magnetization patterns detected from a corresponding succession of arcuate sectors along a circular data track on the disk. A preamble processor generates a corresponding succession of sector pair signals representative of the lengths of adjacent sectors along the data track on a rolling pair-wise basis. A next sector length predictor processor determines for a succession of pairs of sectors, a length ratio of the lengths of the sectors in the respective pairs of sectors. A clock generator generates a periodic clock for each sector of the succession of sectors, wherein the clock rate associated with a current sector has an associated phase deviation relative to a clock rate associated with a previous sector, which is proportional to the length ratio for the current sector and the previous sector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.