Alright I'm selling a PC to a buddy and it has a 40gig HD currently. He has a 50gig HD in one of his older PC's that he would like me to put in the one I'm selling him so he will have some extra storage capacity. Can I just change the jumper setting on the 50gig and be good to go? Since it has the operating system on it, I wasn't sure if it would affect anything? Anyone feel like helping a newbie out??