DualDisc is a controversial new format that is a disc with a DVD layer on one side and a CD-type layer on the other. Since the disc has a slightly different thickness than either a standard DVD or standard CD, it may not have complete playback compatiblity on some DVD and CD players.
DualDiscs are not officially recognized as meeting CD specifications. As a result, Philips, developer of the CD and holder of most CD patents, does not authorize the use of the official CD label on DualDiscs.
For additional terms and definitions, check out my Home Theater Glossary
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