Compact disc

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An optical disc used to store music and data. Commonly abbreviated CD. Compact discs are made from a thin disc of polycarbonate and a metal layer in the middle of the disc. They are available in a range of sizes but the most commonly available by a long way is 120mm in diameter. A 120mm disc can store about 74 minutes of music or about 650 megabytes of data.

Compact discs cannot be easily recorded; they are manufactured by etching a glass plate and using that plate to press metal. However there are also CD-R discs, which can be recorded by a laser beam using a CD-R writer (most often on a computer, though standalone units are also available), and can be played on (most) compact disc players.

The correctness of the spellings "disc" and "disk" is not trivial, see

See also CDDB, CD-ROM