Enermax EB207S-S. Size: 63.5 mm (2.5 "), Hard drive interface: Serial ATA II. Interface: USB 2.0. Compatible operating systems: Windows 98SE / ME /2000 / XP / Vista Mac OS 8.6 +. Colour of product: Silver. Dimensions (WxDxH): 78.3 x 138.8 x 17 mm, Weight: 0.11 kg