Actidata actiDisk RDX, 320 GB. Size: 63.5 mm (2.5 "), Hard drive interface: USB 2.0. Interface: USB 2.0. Compatible operating systems: Microsoft Windows 2000, Windows XP Professional, Windows XP Home, Windows 2008 R2. Operating relative humidity range: 20 - 80 %, Operating temperature range (T-T): 10 - 40 °C, Storage temperature range (T-T): -40 - 65 °C. Colour of product: Black