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MD: a compact digital audio disc from Sony that comes in read-only and rewritable versions. Introduced in late 1993, the MiniDisc has been popular in Japan. The read-only 2.5in disc stores 140MB compared to 650MB on a CD, but holds the same 74 minutes worth of music due to Sony’s Adaptive Transform Acoustic Coding (ATRAC) compression scheme, which eliminates inaudible portions of the signal.

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