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Standard CDs have a diameter of 120 millimetres (4.7 in) and can hold up to about 80 minutes of uncompressed audio or about 700 Mi B of data.The Mini CD has various diameters ranging from 60 to 80 millimetres (2.4 to 3.1 in); they are sometimes used for CD singles, storing up to 24 minutes of audio, or delivering device drivers.Several other formats were further derived from these, including write-once audio and data storage (CD-R), rewritable media (CD-RW), Video Compact Disc (VCD), Super Video Compact Disc (SVCD), Photo CD, Picture CD, CD-i, and Enhanced Music CD.The first commercially available audio CD player, the Sony CDP-101, was released October 1982 in Japan.

The compact disc is an evolution of Laser Disc technology, where a focused laser beam is used that enables the high information density required for high-quality digital audio signals.First published in 1980, the standard was formally adopted by the IEC as an international standard in 1987, with various amendments becoming part of the standard in 1996.Philips coined the term compact disc in line with another audio product, the Compact Cassette, and contributed the general manufacturing process, based on video Laser Disc technology.Prototypes were developed by Philips and Sony independently in the late 1970s.In 1979, Sony and Philips set up a joint task force of engineers to design a new digital audio disc.

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