In computing and optical disc recording technologies, an optical disc (OD) is a flat, usually circular disc which encodes binary data (bits) in the form of pits (binary value of 0 or off, due to lack of reflection when read) and lands (binary value of 1 or on, due to a reflection when read) on a special material (often aluminium ) on one of its fl...
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http://en.wikipedia.org/wiki/Optical_disc
(from the article `information processing`) An entirely different kind of recording and storage medium, the optical disc, became available during the early 1980s. The optical disc makes use of ... Another form of largely read-only memory is the optical compact disc, developed from videodisc technology during the early 1980s. Data are re...
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http://www.britannica.com/eb/a-z/o/24
optical disc, optical disk; laser disk; video disk A grooveless disk on which digital data; such as, text, music, or pictures, is stored as tiny pits in the surface and is read or replayed by a laser beam scanning the surface.
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http://www.wordinfo.info/words/index/info/view_unit/656/2
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