Iomega 33902 FireWire 800/FireWire 400/USB 2.0 1.5TB 2HD x 750GB UltraMax Pro Hard Drive Stylish external 1.5 TB hard drive with triple interface FireWire 800 provides up to 800 Mbps data transfer rates; FireWire 400 provides 400 Mbps and USB offers 480 Mbps HFS+ preformatted for out-of-box Mac use 1-year limited warranty Device measures 7.9 x 6.1 x 6.4 inches (WxHxD)