Mini Disk - 1991
The MiniDisc (MD) is an obsolete magneto-optical disc-based data storage device for 74 minutes and, later, 80 minutes, of digitized audio or 1 gigabyte of Hi-MD data. The Sony brand audio players were on the market from September 1992 until March 2013. The digitally encoded audio signal on a MiniDisc has traditionally been data-compressed using the ATRAC format.
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