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A '''compact disc''' or a '''CD''' is an optical storage device originally used for storing audio data. It was originally created in 1982, and until 1985, was only used for storing audio. Typically, they are 4.7 in (120 mm) in [[diameter]] and hold 700 [[megabytes]]. CDs today are also used for storing other digital information and are called CD-ROMs. In addition, CD-Rs and CD-RWs <ref>http://www.cd-info.com/refs/terms.html</ref> allow consumers to write (and rewrite) their own information, usually with a [[personal computer]].
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