A mounting apparatus is provided for holding a data storage device. The mounting apparatus includes a bracket to receive the data storage device, and a latching unit. The bracket includes a first side plate. The latching unit includes a fixing tray fixed to the first side plate, a sliding member slidably mounted in the fixing tray, and a pushing member pivotably mounted to the fixing tray. The pushing member includes a pressed portion operable of resisting against the sliding member, and a moving portion to abut against the data storage device. When the sliding member is slid in the fixing tray to move the pressed portion, the pushing member is rotated. Therefore, the moving portion is rotated to eject the data storage device from the bracket.