A mounting apparatus for mounting two or more types of data storage devices that each defines a locking hole in a sidewall thereof includes a bracket for holding the data storage devices, a fixing member, and a locking member. The bracket includes a first side wall. The first side wall defines a locating hole therein. The locating hole has at least two locating positions. The fixing member is pivotably mounted to the first side wall of the bracket. The locking member is selectively mounted to at least two positions of the fixing member. The locking member includes a locking portion extending therefrom, for selectively being inserted through the at least two locating positions of the locating hole of the bracket to engage in the locking hole of a corresponding type of data storage device.