Spire HandyBook 3.5" IDE. Size: 88.9 mm (3.5 "), Hard drive interface: IDE/ATA. Interface: USB 2.0. Compatible operating systems: Windows 98/ME/2000/XP/VISTA Mac OS 8.6,OS X. Colour of product: Black. Dimensions (WxDxH): 245 x 130 x 40 mm, Weight: 550 g