Compact disc

A compact disc or "CD" is a flat round disc used to store data. CDs were made in 1979 by Philips and Sony. They are used to store music and other sounds (and sometimes called an "audio CD").

Later, compact discs were made that could be used to put computer files on in the same way as audio compact discs. These are called CD-ROMs (Compact Disc Read Only Memory). The computer 'reads' the disc using a CD-ROM drive.

The length of a normal CD is 120 mm. The middle hole in a CD has is about the size of a five pence coin (About 1.5cm).

Wikimedia Commons has media related to Compact disc.

• CD-R
• CD-ROM
• CD-RW
• Video CD
• DVD

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