Iomega 33558 FireWire 800/FireWire 400/USB 2.0 640GB 2HD x 320GB UltraMax Hard Drive 640 GB external hard drive with FireWire 800, FireWire 400, and USB 2.0 connections FireWire 800 for up to 800 Mbps transfer speeds for a fast connection; also supports FireWire 400 and USB 2.0 Three-port USB hub and three FireWire ports for additional connections 1-year limited warranty Device measures 4.8 x 3.1 x 9.6 inches (WxHxD)