I have been using Adobe Photo for at least 6 years and I have never had this error. I do a lot of contact sheets for my publications. The folders that I use for contact sheets have anywhere from 50 to 200 photos. Recently I have encountered a problem with Photoshop completing the request. It will get to about 60 photos and then give an error that the Scratch Drive is full and cannot complete the contact sheet. My machine has 3 gigs of Ram and 400 gigs of hard drive space with 200 gigs of space free. Any help would be greatly appreciated.