Hi, I've had my WD My Book 1TB Essentials for a while know and I have always wonder why there are two firewire 400 ports aswell as the usb. I understand both firewire and usb but why two firewire 400 ports. It also has a eSata port but that is besides the point. Can I hook up both firewire ports at the same time to one pc/mac or two different computers? how about one usb and one firewire at the same time for faster speeds.