Optical Storage
Optical discs can store data at much higher densities than
magnetic disks. They are therefore ideal for multimedia applica-
tions where images, animation and sound occupy a lot of disc
space. Furthermore, optical discs are not affected by magnetic
fields, meaning that they are secure and stable, and can be trans-
ported through airport metal detectors without damaging the data.
However, optical drives are slower than hard drives.
CDs and DVDs
At first sight, a DVD is similar to a CD. Both discs are 120
mm in diameter and 1.2 mm thick. They also both use a laser
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