Characterizing magnetic recording parameters of a disk drive by evaluating track profile of dual microtracks
US8625224B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2012 |
| Grant date | Jan 7, 2014 |
| Priority date | — |
| Expiry date | Jul 12, 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 head actuated over a disk comprising a plurality of tracks. The head is positioned over a track minus a first delta and a first frequency pattern is written at a first frequency. The head is positioned over the track plus a second delta and a second frequency pattern is written at a second frequency different from the first frequency. After writing the first frequency pattern and second frequency pattern, a third frequency pattern is written substantially centered on the track at a third frequency. After writing the third 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, and a second frequency component is extracted from the read signal representing the second frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.