Drive Bay: 24 x hot-swappable SATA II, III/SAS 6G drive baysCooling Fan: 3 x 80mm rear fansConnector:Six SFF-8088 external connectors, each SFF-8088 port support 4 SAS or SATA drives;O.S. support:OS IndependentPower Supply Options: Come with standard ATX power supply, support optional mini redundant power supply (H x W 5.91x3.39 inch) Dimensions ( W x D x H ): 19" x 18.9" x 7.0" (483mm x 480mm x 176mm)Packing:Double boxesWeight (without hard drive): 17.2 kg/38 lb (NET) 18.6 kg/41 lb (GROSS) Environment Temperature:0/40 °C, 32/104 °F (Operating) -20/60 °C, -4/140 °F (Non-Operating) Relative Humidity: 5% to 95%,non-condensing