I had the same problem with brand new art disks for my digital printer-one computer said it had to reformat the disks. If the disks are not 'rewriteable' you can't hurt them anyways. I had to put the disks in another computer that would see them-and copy the designs to a zip disk-then I could transfer them to the computer that needed it. PC saw them, G3 mac did not. G4 Mac did see them-so now I bring them to that one and just transfer over. If you have more than one computer try it on the other one. Otherwise you will need someone with a computer that can see it to copy them over for you. Roland