Amplitude-based approach for detection and classification of hard-disc defect regions
US8045283B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 23, 2010 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Mar 23, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2516
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a hard-disc drive, a defect region on the hard disc is classified as corresponding to either thermal asperity (TA) or media defect (MD) by generating two statistical measures. A first measure (e.g., α1) is based on (i) the magnitudes of one or both of signal values (e.g., equalizer input or output signal values) and the corresponding expected values of those signal values and (ii) the signs of one or both of the signal values and the expected signal values. A second measure (e.g., α2) is based on the magnitudes of one or both of the signal values and the expected signal values, but not the signs of either the signal values or the expected signal values. The two measures are then compared to determine whether the defect region corresponds to TA or MD.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.