A mounting assembly includes an enclosure, a mounting device and a resilient member. The enclosure defines a mounting hole. The mounting device includes an engaging member, a drive member, and an engaging rod. A positioning groove and a clipping groove are defined in the engaging member. The drive member includes a limiting block. The resilient member is surrounding the engaging rod. The drive member is moveable relative to the engaging member between an unlocked position and a locked position, in the unlocked position, the limiting block is received in the positioning groove, and the engaging rod does not extend through the mounting hole; and in the locked position, the resilient member is deformed, and the limiting block is engaged in the clipping groove to keep the engaging rod extending through the mounting hole to engage with a storage device.