Abstract: A cartridge for use in a disk drive machine. The cartridge includes a compression spring for biasing a plunger to a storage position against a memory disk assembly and thereby pressing the disk assembly against a housing for the cartridge to frictionally restrict its movement within the housing when the cartridge is removed from the machine. Also, the cartridge includes an access door coupled to the plunger by both a tension door spring which will bias the door to a fully closed position when the plunger is in its storage position, and a linkage which will telescope together under a compressive force to allow the tension door spring to move the door to its fully closed position, but will transmit tensile forces when parts of the linkage are engaged to move the plunger against the compression spring to a retracted position spaced from the disk assembly and permit rotation of the disk assembly when the door is opened by a disk drive machine.