I went through the pain just like everbody else this morning but everthing I tired was nothing but failure. Here what I did today when I put my brand new WD120 in an Adaptec enclosure. I pull the jumper (might need it someday so I save it by taping it to the HHD itself) and hook everything up. Once I power it up, I follow the instruction from Oscar999 above and the system recognize it rightaway. In fact, I partition it right there and then, too. In your case, you might want to back up all the files first (things might hit the fan) and then do what I did. Good luck.
