A mounting apparatus includes an enclosure and a mounting device. The enclosure defines a mounting hole. The mounting device includes a receiving member, an engaging member, an engaging rod, and a drive member moveably received in the receiving member. A positioning slot and a cutout are defined in the receiving member. The engaging member includes an engaging block, and the engaging block, abutting the drive member, is received in the positioning slot. A resilient member surrounds the engaging rod. The drive member biases the engaging block to slide in the positioning slot. The resilient component is deformed, and the engaging rod extends through the mounting hole and is received in an securing hole of a storage device; when the engaging block is disengaged from the positioning slot, the drive member is rotated relative to the receiving member, and the engaging block is engaged in the cutout.