The internal hard disk stays where it is, this is just a secondary hard disk. There are scads of USB 2.0 hard disks on the market, not to mention other USB 2.0 devices like CD-RW drives. They work just like internal drives, but they're easy to pick up and move, as well as being great backup. Here's a very low-res webcam picture of one on a dollar bill to give you a sense of scale. This one happens to be a 30gig one I carry around with me.ATO_UAH said:Can you give a little description on your possibly brilliant bit of information so I can convey it better. Basically, you are sayign that you have a portable hard drive plugged into a USB port?? What of the original built in hardrive?