12Gb/s Mini-SAS HD (SFF-8643) Backplane 8 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 2U Redundant or 2U Single Power Supply 1 x External Slim ODD Bay; 2 x Internal 2.5’ HDD Bay 3 x 80mm Central Fans (w/ Individual Easy-install & Anti-vibrations Bracket) 2 x Front USB 2.0; LED: Power On / HDD Activity / LAN1 / LAN2 / Warning 3 x Full Height Horizontal PCI Slots