Disk cartridge, disk driving device using disk cartridge, and storage system comprising disk cartridge and disk driving device

A disc drive apparatus for use with a disc cartridge, said disc cartridge having a cartridge housing for accommodating a disc and formed in a square shape, said cartridge housing also having an access window, a shutter movably mounted on one front side wall portion of said cartridge housing, said shutter being movable between a first position for closing said access window and a second position for opening said access window, a plurality of gripper slots formed on each of lateral side surfaces of said cartridge housing, said lateral side surfaces being perpendicular to said one front side wall portion, and recess portions formed on each of said plurality of gripper slots, said disc drive apparatus comprising:

• a body having an inserting and ejecting port;
• a movable cartridge compartment provided on said body, the movable cartridge compartment movable between an inside position of said body and an ejecting position of said body, the movable cartridge compartment having a loading recess portion and an opening, said opening formed on the bottom surface of said loading recess portion and, when said disc cartridge is loaded on said loading recess portion, being opposite said access window of said disc cartridge;
• and
• engaging portions formed on the movable cartridge compartment for engaging said recess portions of said disc cartridge when the disc cartridge is in a loaded state on the loading recess portion.