An exemplary fixing apparatus is for mounting a hard disk drive (HDD) having a plurality of holes defined in sidewalls and includes a first side plate, a bracket, and a plurality of fixing pins. The bracket includes an end plate, and a second side plate perpendicular to the end plate. One end of the first side plate is pivotably attached to a free end of the end plate of the bracket. The other end of the first plate includes a latch extending therefrom. The second side plate includes a latch extending from a free end thereof, to detachably engage with the latch of the first side plate. The fixing pins are attached to the first side plate and the second side plate to engage in the holes of the HDD.