Form Factor 3U rackmount, Host Interface Three SAS (one input, one output, one reserved) 12Gbps for each controller, 4x port, Buttons Power / Reset, Hard Drive Type 3.5" SAS12/6Gb/s, hard drive or 2.5" SAS SSD, Operating temperature 0 - 40 °C (32°F - 104°F), Relative Humidity 5-95% RH non-condensing, wet bulb: 27˚C (80.6˚F)