Octigen 100577AKOTG. Size: 88.9 mm (3.5 "), 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): 200 x 112 x 38 mm, Weight: 206 g