Discriminating between protrusion defects and recess defects on a disk recording medium
US8427770B1 · kind B1 · utility
70Cited by
36References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 2011 |
| Grant date | Apr 23, 2013 |
| Priority date | — |
| Expiry date | Oct 26, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/84
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus is disclosed comprising a thermal sensor operable to detect at least one protrusion defect and at least one recess defect on a disk, the thermal sensor operable to generate a sensor signal. An attack time of the sensor signal is measured when the thermal sensor passes over one of the protrusion defect and the recess defect, and the protrusion defect is discriminated from the recess defect based on the attack time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.