A mounting apparatus for securing a data storage device (10) defining a number of fixing apertures (101) includes a bracket assembly (20), and a number of resilient gaskets (30). The bracket assembly comprises a first bracket (210), and a second bracket (220). The first bracket comprises a bottom panel (211), and a side panel (212). The second bracket includes a vertical plate (222) secured to the bottom panel of the first bracket. A number of positioning strips (204) some with a tab (206) extend perpendicularly from the bracket assembly to position the resilient gaskets respectively. The vertical plate is resiliently and outwardly moved to sandwich the data storage device in the bracket assembly. The data storage device is secured with the tabs engaging with the fixing apertures thereof.