STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
CD-ROM disc drive. A compact disc (CD) fitted into the opened CD-ROM disc drive of a personal computer. CD-ROM is an acronym for Compact Disc Read- Only Memory. This CD or CD-ROM disc is a very powerful storage medium for information. Information is stored in digital form as a pattern of pits on the aluminium-coated plastic disc. A laser then scans the compact disc. A single CD-ROM disc may store 600 Megabytes of data or more, equivalent to some 300,000 pages of text. As they can also store images and sound, CD-ROM discs are used to run multimedia computer programmes.
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