Abstract: A cartridge holder is shown which comprises a back portion which has at an inner surface a plurality of cartridge gripping parts by which one sides of cartridges are gripped, a pair of lid portions which are pivotally connected to opposed sides of the back portion through respective major hinge portions; catching and caught portions which are provided at free ends of the lid portions and lock the lid portions when the lid portions are pivoted toward their closed position; and a plurality of extra hinge portions which are defined by the back portion. By roundly flexing the back portion at the major hinge portions, the cartridge gripping parts, that is, the cartridges gripped by these cartridge gripping parts are opened like a fan. Thus, upper ends of the cartridges are separated thereby facilitating handling of the upper ends of the cartridges by the fingers of a user.

Abstract: A disc cartridge designed to prevent mistaken loading on a recording and/or reproducing apparatus in which only a disc cartridge having different specifications can be loaded. The disc cartridge includes a main cartridge body portion 13 for housing a magnetic disc 11 having different specifications from those of a magnetic disc housed in a conventional disc cartridge 101, and recording/reproducing apertures 26, 27 formed in the main cartridge body portion 13 so as to be faced by a recording/reproducing unit provided on the recording/reproducing apparatus. The disc cartridge also includes a shutter member 28 for opening/closing the recording/reproducing apertures 26, 27 and loading regulating portions 51, 52 provided on the main cartridge body portion 13 for regulating loading of the main cartridge body portion on the recording/reproducing apparatus 110 in which only the conventional disc cartridge 101 can be loaded.