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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 up to 750 [[megabyte]]s.  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]].

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 up to 750 [[megabyte]]s.  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]]. The [[DVD]] format was designed to be backward compatible with the CD format.<ref>[http://www.infoplease.com/ce6/sci/A0815510.html Digital Versatile Disc]</ref>

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