Macally Hi-Speed 2.5" USB 2.0 External Enclosure. Size: 63.5 mm (2.5 "), Hard drive interface: IDE/ATA. Compatible operating systems: Windows 98SE/ WindowsME/ Windows 2000/ Windows XP Mac OS 9.2, Mac OS X 10.1.to 10.4, Minimum system requirements: desktop/notebook + USB. Colour of product: Black. Dimensions (WxDxH): 279 x 152.4 x 50.8 mm, Width: 279 mm, Depth: 152.4 mm. Package dimensions (WxDxH): 279 x 152.4 x 50.8 mm, Package weight: 906 g, Packaging width: 279 mm