Data storage device detecting media defects by writing opposite polarity test pattern
US9171575B1 · kind B1 · utility
1Cited by
449References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 23, 2014 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Jun 23, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2516
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data storage device is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. A first test pattern having a first polarity is written to a target track, and the first test pattern is read to generate a first read signal. The first test pattern is overwritten with a second test pattern having a second polarity opposite the first polarity, and the second test pattern is read to generate a second read signal. A defect in the target track is detected based on the first read signal and the second read signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.