A disk drive mounting assembly is configured to mount a disk drive. The disk drive mounting assembly can include a carrier configured to receive a disk drive and a retainer configured to be coupled to the disk drive and retain the disk drive in the carrier. The retainer can include a main body, a head extending from the main body, and two wings extending from two opposite sides of the main body and configured to be coupled to the disk drive. The head has a distal end spaced from the main body and the wings. The head has a distal end moving toward the main body when the head is pressed, and has the end moving away from the main body retain the disk drive in the carrier when the head is released.