1.31 What's a hybrid DVD?
Description
This article is from the DVD Formats FAQ, by jtfrog@usa.net (Jim Taylor) with numerous contributions by others.
1.31 What's a hybrid DVD?
Do you really want the answer to this one? Ok, you asked for it...
1. A disc that works in both DVD-Video players and DVD-ROM PCs. (The most
common use of the term hybrid, but more accurately called an enhanced
DVD)
2. A DVD-ROM disc that runs on Windows and Mac OS computers. (More
accurately called a cross-platform DVD.)
3. A DVD-ROM or DVD-Video disc that also contains Web content for
connecting to the Internet (More accurately called a WebDVD or
Web-connected DVD.)
4. A disc that contains both DVD-Video and DVD-Audio content.
5. A disc with two layers, one that can be read in DVD players and one
that can be read in CD players. (More accurately called a legacy or
CD-compatible disc.) There are at least three variations of this
hybrid (none were commercially available as of 9/99):
1. A 1.2mm CD substrate bonded to the back of a 0.6mm DVD substrate.
One side can be read by CD players, the other side by DVD
players. The resulting disc is 0.6mm thicker than a standard CD
or DVD, which can cause problems in players with tight
tolerances, such as portables. Sonopress, the first company to
announce this type, calls it DVDPlus. It's colloquially known as
a "fat" disc.
2. A 0.6mm CD substrate bonded to the front of a semitransparent
0.6mm DVD substrate. Both layers are read from the same side,
with the CD player being required to read through the
semitransparent DVD layer, causing problems with some CD players.
3. A 0.6mm CD substrate, with a special refractive coating that
causes a 1.2mm focal depth, bonded to the back of a 0.6mm DVD
substrate. One side can be read by CD players, the other side by
DVD players.
6. A disc with two layers, one containing pressed (DVD-ROM) data and one
containing rewritable (DVD-RAM, etc.) media for recording and
re-recording. (More accurately called a mixed-media or rewritable
sandwich disc.)
7. A disc with two layers on one side and one layer on the other. (More
accurately called a DVD-14.)
8. A disc with an embedded memory chip for storing custom usage data and
access codes.
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