Fortunately, I overbought drive space this past summer. My 2x2TB RAID1 is only half allocated as it is. I also have a couple of spare drives lying around; a 250GB (which just needs a complete format to kill a virus my wife got last year), a 320GB, and I have a 500GB drive that may have some data on it but I could clear that off. So, if I needed to build another rig for someone who didn't mind a used drive, I'd be ok.