I was using an external Plextor USB drive and an internal Sony drive to make my DVD back-ups. It worked very well. I've now changed the external Plextor for an internal LG 4163 and DVD shrink doesn't see either the LG or the Sony for buring. I have Nero installed OK, as previously. The only thing I've changed is the new drive. It is set to slave. All help appreciated. Many thanks.