Method for determining type of digital versatile discs
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United States of America Patent
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-
Aug 4, 2009
Grant Date -
Dec 1, 2005
app pub date -
Mar 9, 2005
filing date -
May 25, 2004
priority date (Note) -
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Abstract
A method for determining the type of digital versatile discs (DVDs) is provided, for distinguishing among a read only memory (ROM) DVD, a recordable DVD and a re-writable DVD. The method includes reading a tracking error signal from a DVD. If the amplitude of the tracking error signal is greater than a first predetermined value, the DVD is a recordable DVD; otherwise, a recorded area (RECD) signal is read from the DVD. If the RECD signal is zero, the DVD is a blank re-writable DVD; otherwise, a total RF level signal is read from the DVD. If the total RF level signal is greater than a second predetermined value, the DVD is a DVD ROM; otherwise, the DVD is a re-writable DVD with data.
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