DVDs and CDs are both types of optical storage. Optical discs such as DVDs and CDs are certainly more durable than previous storage methods, however, they can still be damaged through everyday use and exposure to the environment.
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CD and DVD storage technologies are typically classified as computer data storage. They can also be referred to as external storage.
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The main growth technologies were DVD-ROM drives and writable CD and DVD drives, whereas revenues from floppy drives and cartridge drives had stagnated.
CD & DVD are examples of Secondary Storage Devices.
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A DVD. Apex.
Tape, DVD, CD, Floppy Disk
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CD's and DVD's are not magnetic. They are optical storage devices that are read with LASER beams.
All CD, DVD's and blu-ray's are multiplexed optical data storage. This is what movies and music is on.
There are micro craters that a laser "reads"