Method of detecting a defect area of a disk

Details Method of detecting a defect area of a disk Method of detecting a defect area of a disk

2006-08-15

2006-08-15

Korzuch, William (Department: 2656)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053170, C369S053150, C369S047140

Reexamination Certificate

active

07092334

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.

REFERENCES:
patent: 6463021 (2002-10-01), Nakane et al.
patent: 6483790 (2002-11-01), Nakane et al.
patent: 6621782 (2003-09-01), Nakane et al.
patent: 2001/0021148 (2001-09-01), Yokoyama et al.
patent: 2001/0055247 (2001-12-01), Tateishi et al.
patent: 2002/0027852 (2002-03-01), Nakane et al.
patent: 2004/0233805 (2004-11-01), Yoshida et al.

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