A mounting apparatus is provided for a storage device. The 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 on an inside surface thereof, for engaging the storage device. The first fixing arm forms a receiving arm perpendicularly extending out from an end thereof. A sliding arm perpendicularly extends out from the second fixing arm and slidably received in the receiving arm. A locking portion is 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, and an engaging surface. The operating portion is manipulated to allow the engaging surface to engage and disengage a side of the locking portion facing the second fixing arm.