Abstract: A system for recording and/or reading signals on/from information carriers (4) accommodated in cassettes (2) composed of cassettes (2-3A) of a first type and cassettes (2-3B) of a second type, which two types of cassettes have substantially identical dimensions and shapes apart from local identifying distinctive features (22-3A, 26-3A; 22-3B, 26-3B) of a first type and of a second type respectively. Drive apparatus constructed to cooperate with a cassette of the system when inserted in a correct orientation. Drive apparatus of the first type, is constructed for cooperation with cassettes (2-3A) of the first type but not for cooperation with cassettes (2-3B) of the second type, and drive apparatus of a second type, is constructed for cooperation with cassettes (2 3B) of the second type but not for cooperation with cassettes (2 3A) of the first type.

Abstract: A cassette accommodates an information disc (1) which is rotatable inside a housing (2) and which can be read by means of a pick-up which is movable over the disc surface through an aperture (6) in a main wall (3). To enable the information disc to be exchanged rapidly and conveniently, the disc receiving space in the housing is readily accessible in that a shutter (16), which includes at least one of the transverse walls (4, 5, 17) of the housing, can be moved to an open position.