Approx APPHDD01B. Size: 88.9 mm (3.5 "), Hard drive interface: Serial ATA, Serial ATA II. Interface: USB. Compatible operating systems: Windows XP, Vista, 7 Mac, Minimum system requirements: USB. Colour of product: Black. Dimensions (WxDxH): 195 x 110 x 30 mm, Weight: 270 g