Universal Serial Bus (USB)and FireWire (also known as i-Link or IEEE 1394) are two of the more common cables used to connect peripheral devices. USB is used with printers, scanners, external CD-RWs, and external hard drives. FireWire is a faster connection that is most commonly used for external hard drives, CD-RWs, scanners, and digital video equipment.
USB 2.0 is a faster version of the USB 1.1 standard while FireWire 800 is a faster version of the FireWire 400 standard. USB 2.0 is plug-compatible with USB 1.1 while FireWire 800 requires an adapter to fit into a FireWire 400 plug.