Cisco HDT0000. Size: 88.9 mm (3.5 "), Hard drive interface: Serial ATA. Operating relative humidity range: 10 - 90 %, Operating temperature range (T-T): 0 - 45 °C, Storage temperature range (T-T): -20 - 70 °C. Dimensions (WxDxH): 104.14 x 25.4 x 172.72 mm, Weight: 170 g