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What are MiniDiscs?MiniDiscs were announced in 1991 by Sony as a disc based digital medium for recording and distributing consumer audio that is ``near CD'' in quality. In 1993 Sony announced MD Data, a version of the MiniDisc for storing computer data.There are two physically distinct types of discs: Premastered MDs, similar to CDs in operation and manufacture, and Recordable MDs, which can be recorded on repeatedly and employ magneto-optical technology. The disc itself is enclosed in a small (7cm x 7cm), convenient, cartridge. |