Norco 3U Rack Mount 16 x Hot-Swappable SATA (II or III)/SAS Drive Bays Rack Mount Chassis RPC-3116 3U rack mount design 16x hot-swappable SATA (II or III) / SAS drive bays Sixteen sata data connectors support up to sixteen 3.5" or 2.5" SATA (II or III) or SAS hard disk drives Hot-swappable HDD tray with special designed power-off and lock mechanism. 1 x slim CD-ROM bay,2 x 2.5" OS drive brackets, 16 x 3.5" hot-swappable drive bays Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6"), Mini ITX (6.7" x 6.7") motherboard Redundant 4pin Molex PSU connectors support redundant power supply