Fujitsu STORAGEBIRD 40GB USB2.0. Hard drive capacity: 40 GB, Hard drive interface: USB 2.0, Hard drive size: 6.35 cm (2.5"). Compatible operating systems: Microsoft Windows 98/2000/Me/XP, Dimensions (WxDxH): 80 x 135 x 25 mm, I/O ports: USB 2.0, FireWire, IEEE1394