A system and apparatus are described for removably mounting one or more hard disk drives within a computer system. According to one embodiment, the system includes a disk drive carrier cage configured to receive a disk drive backplane and up to eight pair of disk drive carrier rails. The disk drive carrier cage is sized for insertion into a drive bay having the dimensions of two optical mass storage devices compatible with a 5.25 inch form factor. The system also includes a disk drive backplane for receiving up to eight hard disk drives, disk drive carriers for holding the hard disk drives, and disk drive carrier rails mountable within the disk drive carrier cage for slidably receiving the disk drive carriers. The disk drive carriers and disk drive carrier rails are translucent thereby permitting light emanating from the backplane to be viewed at the front of the cage.