A mounting apparatus is provided for mounting a data storage device to a drive bracket. The data storage device is locked to the drive bracket via a locking module. The locking module includes a housing member attached to the drive bracket, and a pushing member, a locking member, and a releasing member that are attached to the housing member. The pushing member is driven by a pushing action of the data storage device for releasing the locking member in a first direction for locking the data storage device. The locking member is driven by the releasing member for unlocking the data storage device in an opposite direction with respect to the first direction.