A MiniDisc (MD) is a magneto-optical disc-based data storage device initially intended for storage of up to 80 minutes of digitalized audio. Today, in the form of Hi-MD, it has developed into a general-purpose storage medium.
MiniDisc was announced by Sony in 1991, and was in competition with Philips and Matsushita Digital Compact Cassette (DCC) system.
MiniDisc technology was faced with new competition from the recordable compact disc consortium, while the popularity of traditional cassette tape refuses to wane in certain quarters. MiniDisc is widely respected as being a very reliable format when it comes to portable audio storage, such as field recording.