hmmm i'm not totally sure how to go about that. the first thing that pops into my mind is those little usb adapter hard drive enclosures. if that is what you are using then you can remove the hard drive easily from the usb system and just install it as a regular drive. i'm not sure if the fully integrated usb hard drives use standard 3.5" hard drives that could be removed from the housing and used normally or not...
AMD 64 3800+
X-connect 500W psu
Custom Quake box under planning and soon to be under construction