Characterizing head parameters of a disk drive by evaluating track profile of an overwritten track
US8717695B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 2012 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Jul 7, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/455
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. The head is positioned over a track while writing a first frequency pattern substantially centered on the track at a first frequency. After writing the first frequency pattern, a second frequency pattern is written substantially centered on the track at a second frequency, wherein the second frequency pattern is written over the first frequency pattern. After writing the second frequency pattern over the first frequency pattern, the head is scanned across the track while reading the disk to generate a read signal. A first frequency component is extracted from the read signal representing the first frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.