Multiple data layer optical disk with recorded information identifying the type of tracking
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United States of America Patent
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Apr 28, 1998
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N/A
app pub date -
Feb 24, 1997
filing date -
Jun 4, 1991
priority date (Note) -
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Abstract
A multiple data layer optical medium, such as an optical disk, has a plurality of substrates, each of which has a data surface. The laser light beam from the optical data recording system is maintained on the data tracks of the two spaced-apart data surfaces by the use of tracking marks contained on the data surfaces. One of the data surfaces includes recorded information that identifies the type of tracking marks present.
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