Hi, I inherited a FD-91, and I immediately got the C:13:01 error. I kept on trying new floppies, formatting in the camera, and then the tab bending, without any fix. I got lucky and found one floppy that worked. The only thing that was different about this flopy is that when I tried formatting in on the camera, it took a while. This led me to an idea. I knew that all of the floppies that I had tried were not bad. I instead used a strong magnet and made one BAD. This time the floppy started the long format, and this time no C:13:01 errors. Hope that this helps someone

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