Macally FireWire External Enclosure. Size: 63.5 mm (2.5 "), Hard drive interface: IDE/ATA. Compatible operating systems: Mac OS 9.2/Mac OS 10.1.5/Mac OS 10.2/Mac OS 10.3/Mac OS 10.4., Minimum system requirements: Desktop/notebook + USB/FireWire.. Colour of product: Silver. Dimensions (WxDxH): 9.8 x 16.73 x 2.62 mm, Width: 9.8 mm, Depth: 16.73 mm. Material: Aluminium