12Gb/s Mini-SAS HD (SFF-8643) Backplane 12 x 2.5' SAS (III-I) / SATA (III-I) Interface SSD / HDD Hot-Swap External Drive Bays Support 2.5' Enterprise HDD (H=15mm) Support M/B Size up to E-ATX (12'x13') Support a 1U Redundant, 1U Single or FlexATX Power 6 x 40 * 40 * 56mm High CFM Central Cooling Fans 1 x Front USB 2.0; LED: Power On / HDD Activity / LAN1 / LAN2 / Warning