The only problem with doing that bro, would be that the two computers would have to be exactly the same. If you take a drive from one computer that is runningn OS nd insert it into another, you would have to go through the process of reloading the OS. Bty the sounds of it he wants to take his "dump" drive where he keeps his info and move it over to his working computer. If he wished to take both drives out and use both OS, he better be prepared for thesometimes hassle of doing so.