
Basics DVD-ROM Drive Technology - 37
Compared to CD, DVD uses smaller pits and a more closely
spaced track.The result is a significant increase in data
density. The higher Numerical Aperture (NA) lens of DVD
helps the laser focus on the smaller pits.
Like CD, DVD is 120 mm (4-3/4 inches) in diameter. Like
CD, DVD is 1.2 mm thick composed of (2) 0.6 mm
substrates bonded together. The new DVD Players will be
able to play existing music CDs.
The DVD standard defines a disc that maintains the overall
dimensions, look and feel of the current Compact Disc. Some
of these similarities will be unmistakable to customers
experiencing DVD for the first time.
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