CDs and DVDs
How does a DVD-ROM
store data?
p. 368 Fig. 7-28
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DVD-ROM Storage Capacities
Sides Layers Storage Capacity
1 1 47
GB
1 1 8.5
GB
2 1 9.4
GB
2 2 17
GB
ØTwo layers of pits are used, lower
layer is semitransparent so laser can read through
ØSome are double-sided
ØDVD+RW is a rewritable DVD
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