Octigen 100576AKOTG. Size: 63.5 mm (2.5 "), Hard drive interface: IDE/ATA. Interface: USB 2.0. Compatible operating systems: Windows 98SE/ME/2000 SP4/XP SP2/Vista/7 MAC OS 10.2+. Colour of product: Black. Dimensions (WxDxH): 130 x 70 x 15 mm, Weight: 86 g