The Western Digital My Book's are one of the most reliable, quiet running and popular models around. This one, the Premium 1c edition, has both USB2 and 2x Firewire ports. It's also been reduced to £79.99 including free SuperSaver delivery from Amazon...
# Easy to set up, easy to use
# Dual USB/Firewire interface
# The My Book drive turns itself on and off with your computer and Safe Shutdown" prevents the drive from being powered down until all your data has been written
# The elegant case, iconic of a book, takes up less space on your desk, stacks horizontally, and allows two or more drives to nestle neatly together like volumes on a shelf
# Inside the case is an exceptionally fast-ultra quiet, cool-running hard drive from Western Digital
# Free Google" software