Seagate 400 GB External USB 2.0/FireWire Hard Drive with Backup Stackable external 7,200-rpm hard drive with a 400 GB capacity and an 8 MB cache Offers a choice of USB 2.0 and FireWire (IEEE 1394a) interfaces (both cables provided) Built-in self-monitoring technology continuously checks the drive for data safety and drive performance Hot-swappable, so you can connect and disconnect without turning off your computer Includes award-winning BounceBack Express software; backup your files with a schedule and/or at the touch of a button