Discrimination method of optical storage medium
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United States of America Patent
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Nov 30, 2010
Grant Date -
Apr 29, 2004
app pub date -
Oct 23, 2003
filing date -
Oct 24, 2002
priority date (Note) -
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Abstract
A method for discriminating an optical storage medium is disclosed. A predetermined range of the optical storage medium is read after the light source is focused on; and thereby a plurality of data transition points and transition regions defined by an interval of two neighboring points are obtained. Thereafter, the time-consumption for reading the longest transition region is used to determine the type of the currently accessed optical storage medium. Another physical characteristics according to data storage formats, such as the PLL clock frequency or the distance between the reflection layer and the surface layer of the optical storage medium, may be used as references to discriminate the currently accessed optical storage medium.
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