12Gb/s Mini-SAS HD (SFF-8643) Backplane 24 x 3.5’ or 2.5’ SAS (III-I) / SATA (III-I) Interface SSD / HDD Hot-Swap External Drive Bays Support M/B Size up to E-ATX (12’ x 13’) Support a Mini-Redundant or PS2 Single Power Supply 2 x 120mm Central Fans (w/ Individual Easy-install & Anti-vibrations Bracket); 2 x 80mm Rear Fans LED: Power On / HDD / Activity / LAN1 / LAN2 / Warning 7 x Full Height Vertical PCI Slots