Supermicro Storage JBOD Chassis 2U 826BE1C-R741JBOD Up to 12 x 3.5"/ Expander Backplane(4xminiSASHD SFF-8643) Type: Rack Mount; Rack Mount: 2U; 3.5" External Compartments (Hot swap): 12; External Compartment Features: SAS3/2 or SATA3 drives with 12GB/with capacity; Installed fans: 3 x 80?38mm hot-swap fans; Power supply: 2 x 740 W; Power Supply Type: Fixed; Maximum number of power supplies: 2; Power Supply Features: 80 Plus Platinum Certified