I have experienced this problem twice now and have been lucky enough to find a program called cdroller. It can be downloaded at www.cdroller.com but doesn\'t allow you to recover found information until you pay for the liscensing. I had some pictures that were not replaceable on a disc when I got this message. It was well worth 29.95 to retrieve them. I used the cdroller program this weekend and although it took a long time to scan the disk, it worked and I got all my pictures