Iomega 33656 Professional Silver Series 500 GB Triple Interface External Hard Drive 500 GB 3.5-inch 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 7200 RPM and 8MB cache buffer for speedy performance 1-year limited warranty Device measures 4.75 x 1.4 x 8.75 inches (WxHxD)