A mounting apparatus for mounting a data storage device that has a protrusion protruding from a sidewall thereof includes a bracket for holding the data storage device, a mounting member, a locking member, and a resilient member. The bracket includes a first side wall. The first side wall defines a slideway, for receiving the protrusion of the data storage device to slide therealong. The mounting member is mounted to the first side wall. The locking member slidably mounted to the mounting member includes a projecting part adjacent the slideway of the bracket, for locating the protrusion of the data storage device. The resilient member is located between the mounting member and the locking member.