A mounting apparatus for mounting a data storage device that defines a locking hole in a sidewall thereof, includes a bracket for holding the data storage device, a first locking member, and a second locking member. The bracket includes a side wall. The side wall defines a through-hole therein. The first locking member is pivotably mounted to the side wall of the bracket. A locking portion protrudes from the first locking member for being inserted through the through-hole of the bracket to engage in the locking hole of the data storage device. The second locking member is pivotably mounted to the side wall of the bracket, and releasably mounted to the first locking member.