Method and apparatus of identifying disc types

Details Method and apparatus of identifying disc types Method and apparatus of identifying disc types

2005-09-16

2009-08-18

Ortiz Criado, Jorge L (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S047100, C369S053230

Reexamination Certificate

active

07577072

ABSTRACT:
Embodiments of a method and apparatus of identifying optical disk types according to the present invention can identify the type of an optical disk (e.g., DVD-RAM, DVD-RAM, or DVD+/−RW) based on comparisons between a plurality of signals. For example, comparisons between the magnitudes of DPD and DPP tracking error signals and their respective reference values can be used. If an optical disk is identified as DVD+RW or DVD−RW, embodiments according to the present invention can further determine whether the optical disk is DVD+RW or DVD−RW. For example, the frequency of a wobble signal resulting from the shape of tracks formed on the optical disk and variables that affect the wobble frequency (e.g., the rotational speed of the optical disk and the current track position) can be used.

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