Method of detecting a defect area of a disk
US7092334B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 2002 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Jan 29, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/2545
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method of detecting a defect area without any mistake during data recording on a writable disk. This method detects a level of a servo error signal produced during a recording operation, checks whether the servo error signal is in an abnormal state based on the detected level, detects a periodic wobble signal or periodicity of the abnormal state occurrences of the servo error signal produced during the recording operation, and determines whether a recording area is in defect based on successful decoding of the detected periodic wobble signal or the periodicity of the abnormal state occurrences if the servo error signal is in an abnormal state. This method ensures exact detection of a defect area, whereby unnecessary speed reduction can be eliminated and successful data writing can be also guaranteed even in a defect area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.