Hi, i need to add an extra hardrive to my dad's pc so he can back up music, videos and pictures etc...there currently is only one disk at the moment and that has everything on it. My question is how do i safely add this extra hardrive (formatting it presumably) without losing the current windows install. I ask because when i tried to do it with my own PC i ended up losing everything, could somebody guide me through the procedure? Thanks very much, John.