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Also called Compact Disc Read Only Memory, it is a non volatile optical data storage medium which uses the same physical format as audio CDs readable by a computer with a CD-ROM drive. It is a flat, metallized plastic disc with digital information encoded on it in a spiral from the center to the outside edge.
The yellow book standard was established in 1985 by Philips and Sony. Apple and Microsoft were the early companies to promote CD-ROM.
It is an optical disc storage media format which can be used for data storage including movies with high video and sound quality. DVDs are similar to compact discs with regards to their physical dimension but they are encoded in a different format with much higher density. The official specification is maintained by the DVD forum.
They are made from 0.6 mm thick disc of polycarbonate plastic coated with a much thinner reflective layer of gold or aluminum These discs are glued together so that they can be read from one side or both side.
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