3GO HDD25L. Size: 63.5 mm (2.5 "), Hard drive interface: Serial ATA, USB 2.0. Compatible operating systems: Windows 95/98/Me/2000/NT/XP/Vista. Colour of product: Green. Dimensions (WxDxH): 92 x 52 x 33 mm, Weight: 73 g. Material: Aluminium