To my surprise he knows what it is and what it is for..lol Or I would have never told him to do it. BTw.. he did call me this morn. He complained that his hands were hurting so he did not set any jumpers. He is still in his Windows 80 gig. ALthough, i do get a feeling that the 500 gig wont boot, cuz there is no sata drivers on the sata drive..arggg I will meet with him this tues......coming up.