I have a 40 gig hdd and i have another 40 gig hdd just lying around. I would like to add this one to my pc in conjuntion with the other hdd. Do I need to change the jumper on the secondary hdd? Also do I need to re format my whole computer to have both hdd's appear as one or is this even possable? I am rung xp pro svc pack 2. Any detailed instructions on getting this procedure done would be greatly appreciated. I know it can't be to difficult but I have never added two hdd as one before.