A mounting apparatus includes a bracket, and an operating device. The bracket includes a first fixing arm, and a second fixing arm each forming a latching portion, for engaging a storage device. The first fixing arm forms a receiving arm perpendicularly extending from an end thereof. A sliding arm perpendicularly extends from the second fixing arm and slidably received in the receiving arm. A locking portion and a pole are formed on the sliding arm. The operating device is rotatably attached to the received arm. The operating device includes an operating portion exposed out of the bracket, an engaging surface, and a pushing wall. The operating portion is manipulated to allow the engaging surface to engage and disengage the locking portion of the sliding arm, and the pushing wall to push the pole and drive the second fixing arm to move away from the first fixing arm.