as was said eariier, put the 120gig in a anti-static bag and put it away on a shelf or some place safe for awhile, use the raptor and make sure it is performing for you, then you can reformat the 120 and install as a storage drive. Without doing a fresh install on the raptor you will most likely see no real increase in performance from the 120, maybe a little, its alway good to do fresh installs, you should have backups of all your programs and files on hand so that you are ready to do a reformat at any time.