Abstract: A magazine box is provided for removably storing a plurality of disc-storing magazines used in a disc apparatus for feeding a disc to each of a plurality of disc drives. The magazines each include a tray for storing the disc, a case for removably storing the tray, and a first locking mechanism for releasably locking the tray to the case. The magazine box further includes a second locking mechanism for releasably locking the case of each of the plurality of magazines to the magazine box, and the second locking mechanism maintains the locked state at least during the automatic tray-ejection from the case in the disc apparatus is conducted.

Abstract: A disc cartridge includes a case body for receiving disc-shaped recording media in an axial direction of a central shaft so that first and second shells respectively having a base surface portion parallel to a recording surface of the disc-shaped recording media are coupled separated by axial engagement/disengagement; and a lock lever supported perpendicular to the axial direction in the case body and locking the shells coupled. The shells are separated to form a disc insertion/extraction hole for the insert or discharge of the disc-shaped recording media into/from the case body. A support shaft serving as a pivoting point of the lock lever is installed to the case body. The lock lever includes a supported portion supported by the support shaft, a lock portion protruding from the supported portion and locking the shells, and a balance portion protruding from the supported portion approximately opposite to protrusion of the lock portion.