When you need a ton of removable storage yet still need to economize on rack space, the RXO-3390 3U rackmount computer delivers. It has 16 SATA swappable, removable drive bays and still finds room for a slim 5.25” bay for a CD-ROM. This 3U rackmount computer is an advanced Opteron server or workstation that does a lot with a little space and still lets add in long cards.