Abstract: A compound CD-ROM drive includes an optical device, a media output/input device and a hard drive received in a case which has an output port and an electrical power connection port so that the optical device, the media output/input device, the hard drive and a power supply are connected to a computer.

Abstract: An optical disc drive and a casing enclosing the optical disk drive are disclosed. The casing is a hollow and half-closed rectangular parallelepiped. A vertical end surface of the casing has an insertion opening for inserting the optical disc drive into an internal space thereof. An opposite vertical end surface of the casing is closed by a circuit board. The circuit board includes an interface connecting cable and a power supply cord respectively connected to the corresponding connection component of the optical disc drive. The casing has a bottom opening on a rear portion of the bottom thereof. A removable bottom cover openably closes the bottom opening. The optical disc drive is fixed in the internal space of the casing.