Abstract: A disk cartridge for data storage includes a door assembly which is opened as the disk cartridge is inserted in the disk drive. A rotatable cartridge door rotates between a open position and a closed position by moving a flexible band attached to the cartridge door. An end of the flexible band extends through a slot in the side wall of the disk cartridge such that the end of the flexible band can be caught by a leaf spring hook of the disk drive. The leaf spring hook within the disk drive grasps the end of the flexible band and holds the flexible band stationary in the disk drive as the disk cartridge is inserted. The cartridge door is opened by drawing the flexible band along the side wall of the disk cartridge. The rotatable disk cartridge door according to the present invention requires less vertical space and creates less particulate contamination than known disk cartridge door assemblies.