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Compact Disc: Difference between revisions
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The first form of digital [[Optical Disc]], and one of the two most popular and ubiquitous forms (the other being [[DVD|DVDs]]). Compact Discs, or CDs as they are generally known, are usually 12 centimetres (approx. 5") across and are shiny on at least one side (the one without a label painted or burned on). They are mostly used for two things: music and computer data. (Yes, all those free coasters from your favorite ISP were compact discs, and the ones on sale for ten bucks at the checkout counter still are.) The two can overlap - [[
In its original form, the format can hold up to 650 megabytes of data or 74 minutes of "CD Quality" music (the number was supposedly chosen because a [[Sony]] executive figured that that was just long enough to hold all of [[Ludwig Van Beethoven]]'s Ninth Symphony). Unofficial revisions pushed this limit up to 870 megabytes of data or 99 minutes of audio. Data CDs these days usually hold 700 megabytes. Music CDs are about the same as they ever have been, since the record labels rarely use all 74 minutes. Not every CD a record label releases is a music CD, however; if it also contains music videos, then it's a data CD. That kind may be marked "enhanced".
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