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Optical Versus Magnetic Media

Optical Media

more durable:  not ruined by dust or moisture, nor are they vulnerable to electrical damage (however, they can be damaged by physical damages such as scratches).

MTBF rating (average life expectancy) ranges between 30 and 300 years, while magnetic media utilize magnetic properties that have a MTBF of about 3–7 years.

Magnetic Media

Less expensive per MB than magnetic disks

Can be written and read faster than optical disks (except for floppy disks)

Most hard disk drives offer greater capacity than any currently available optical device

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