A mounting apparatus includes a bracket (10) for receiving a storage device (70). An aperture (129) and four holes (125) are defined in a wall (12) of the bracket. A spring-loaded slidable member (30) is movably attached to the wall, and includes a protrusion (331) extended in the bracket through the aperture thereof. A retention member (50) is slidable relative to the slidable member. Four latches (513) are formed on the retention member in alignment with the holes of the bracket respectively. When the slidable member is moved in a first direction by means of the storage device driving against the protrusion thereof, the retention member is moved in a second direction to drive the latches through the holes of the bracket for engaging the storage device.