So I keep my media files on an external hard drive (I have over 200gigs of stuff and my mac mini only has a 160GB hard drive). Currently, I have a 750GB WD MyPassport that I have connect by USB. At my onetoone session yesterday, the genius that I worked with suggested that I use a usb hard drive as my time machine backup and get a FireWire hard drive for regular daily use. He thought I would get a better speed for watching video straight from the hard drive with FireWire. Thoughts? Is it really necessary? I kind of like the idea to free up a USB plug, but I wonder how necessary it is.