
Basics DVD-ROM Drive Technology - 35
To squeeze all this information onto the CD-sized disc, DVD
disc designers: 1)made track spacing and the pits and lands
used to record data nearly half the size of the original CD
design; 2) made the discs double sided and added another data
layer to each side creating a potential for four layers of data
per disc.
The figure below illustrates the layers of a DVD disc.
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