layer. The effective limit of the layers that can be used are a function of the diffi culty
in manufacturing multiple layers, spherical aberration compensation, and the optical
losses due to absorption when reading the different layers.
3.4 Optical Disc Form Factors
The most popular optical disc drive form factor is the 5.25-inch size common to CDs
and DVDs. There have been many other form factors that have been introduced, and
some of these are still in use, including the mini-DVDs used in some camcorders and
mini-CDs that have been popular in Japan. The vast majority of optical discs are read-
only discs used for ...
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