The MiniDisc (MD) is a magneto-optical disc-based data storage format offering a capacity of 60, 74, and later, 80 minutes of digitized audio or 1 gigabyte of Hi-MD data. Sony brand audio players went on the market in September 1992.^[1]

Sony announced the MiniDisc in September 1992 and released it in November of that year for sale in Japan and in December in Europe, Canada, the US and other countries.^[2] The music format was originally based on ATRAC audio data compression, but the option of linear PCM digital recording was later introduced to meet audio quality comparable to that of a compact disc. MiniDiscs were very popular in Japan and found moderate success in Europe.^[3] Until March 2011 Sony had sold 22 million MD players.^[4]

Sony has ceased development of MD devices, with the last of the players sold by March 2013.^[5]

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