Bays 12 x 2.5"/3.5", 192TB, Connections 4 x Mini SAS (SFF-8644), Drive Interface SAS, Rackmount, Power 299.79 W (Typical), 2 x 500 W, 100 to 240 VAC, 50 / Temperature 32 to 95°F / 0 to 35°C, 5 to 95%, Storage Temperature -4 to 140°F / -20 to 60°C, 4 x 60 mm Fans. Expand the storage capacity of your Synology server by installing the RXD1219sas 12-Bay Storage Expansion Unit onto your network. The unit includes 12 hot-swappable 3.5 / 2.5" SAS drive bays for 192TB of total raw capacity.