All Enterprise servers include a media tray for one CD-ROM drive and one tape drive. The drives connect to the wide SCSI connector of the first I/O+ board (in card cage slot 1).
Enterprise 6500/5500 servers-- the media tray is located in the front upper left part of the rack, and the drives are mounted vertically. (Up to four additional SCSI drives may be mounted in the area to the right of the CD-ROM/tape tray.)
Enterprise 4500 server--the media tray is located in the front, immediately above the card cage, and the drives are mounted horizontally. (The Enterprise 4500 server does not have space for additional internal drives.)