Penguin
Annotated edit history of MiniDisc version 1, including all changes. View license author blame.
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1 PhilMurray 1 A proprietry recordable media used for music, invented by Sony.
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3 They're 7cm x 6.75cm x 0.5cm in size and the disc inside is 64 mm in diameter. They hold 160MB of data and use Sony's compression format ATRAC to store upto 74 minutes of audio.
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5 Hi-MD discs (just released) can hold upto 1GB of data and support music in WMA, MP3 and (various flavours of) ATRAC codecs.