A mounting apparatus for mounting a data storage device to a chassis includes a main body and two reinforcing members. The main body includes a top surface, a sidewall depending from the top surface, and a supporting wall extending upward from the top surface. Each of the two reinforcing members includes a reinforcing plate, a first fixing plate extending from an edge of the reinforcing member, and a second fixing plate extending from another edge of the reinforcing member. The first fixing plate is fixed on the supporting wall. The second fixing plate is fixed on the top surface.