Iomega Portable Hard Drive, FireWire 400/USB 2.0, 160GB - 33749 160 GB 2.5-inch external hard drive with USB 2.0 and FireWire 400 connections Support for both USB 2.0 (480 Mbps transfer rate) and FireWire 400 (400 Mbps transfer rate) Bus-powered design eliminates need for power supply 1-year limited warranty Device measures 2.9 x 0.6 x 5.1 inches (WxHxD)