<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony and released in 1982 . The format was originally developed to store and play only sound recordings but was later adapted for storage of data (CD - ROM). 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, PictureCD, CD - i, and Enhanced Music CD . The first commercially available Audio CD player, the Sony CDP - 101, was released October 1982 in Japan . </P> <P> 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 MiB 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 . </P> <P> At the time of the technology's introduction in 1982, a CD could store much more data than a personal computer hard drive, which would typically hold 10 MB . By 2010, hard drives commonly offered as much storage space as a thousand CDs, while their prices had plummeted to commodity level . In 2004, worldwide sales of audio CDs, CD - ROMs and CD - Rs reached about 30 billion discs . By 2007, 200 billion CDs had been sold worldwide . </P>

The standard compact disc measurements set by philips and sony
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