A mounting apparatus is used to fix a flash drive mounted on a circuit board with a connector. The mounting apparatus is mounted on the circuit board and receives the flash drive and connector. The mounting apparatus includes a base board, and a first sidewall and a second sidewall opposite to each other. The second sidewall defines a receiving space. The first sidewall is pivotably connected to the first sidewall, and includes a deformable engaging portion, away from the first sidewall, to be engaged in the receiving space.