A mounting apparatus is provided to hold a number of data storage devices each including opposite sidewalls. The mounting apparatus includes a bracket, a number of fasteners, and a number of fixing members. The fasteners are fixed to the sidewalls of each data storage device, respectively, and each fastener includes a head portion abutting the corresponding sidewall. Each fixing member includes a main body fixed to the bracket, a number of cushioning boards fixed to the main body, and a number of guiding rails fixed each fixed to a corresponding one of the plurality of cushioning boards. Each guiding rail defines a sliding groove. When the data storage devices are moved along two adjacent fixing members, the head portions are slid in the corresponding sliding grooves.