Method for determining disk type

Details Method for determining disk type Method for determining disk type

2008-01-31

2010-10-05

Chow, Van N (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044250

Reexamination Certificate

active

07808868

ABSTRACT:
A method for determining a disk type is provided. In the invention, a pickup head of a DVD optical drive is moved to a blank area of the disk where no data is stored. After rotation of the disk is stopped, the blank area is irradiated with a laser beam, and reflective signals reflected from a surface layer and a reflective layer of the disk are measured respectively. According to a time difference between the two reflective signals, the type of the disk placed in the DVD optical drive is determined. Therefore misjudgment because of effects of pits in a data area of the disk on the reflective signals can be avoided, so that the disk type can be accurately determined.

REFERENCES:
patent: 5587981 (1996-12-01), Kamatani
patent: 6044048 (2000-03-01), Oinoue et al.
patent: 2006/0007812 (2006-01-01), Nishi et al.
patent: 2006/0018214 (2006-01-01), Fujii et al.
patent: 2006/0164954 (2006-07-01), Hashimura

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