Abstract: A tray for loading and ejecting a disk into and out of a disk drive includes a step wall structure that defines a positioning area for receiving the disk and a clamping arrangement used to hold the disk during loading and unloading when the disk drive is in a vertical position. The clamping arrangement is made up of a clamping device biased by an elastic member so as to apply a radial force to the disk and urge the disk against the step wall. The clamping device includes a flexible mortise slot that engages a pillar extending from the tray to latch the clamping device and thereby disable the clamping device when the disk drive is horizontally positioned.