I wonder if anyone has seen this before. I fixed the optical sensors (write protect and index) on my Tandy 1000 teac drive, and it will give a write protect error if I try to delete a file, but format does not fail immediately. It goes through the motions like it is formatting, but at the end when it tries to write the fat/directory, THEN it fails with a write protect error. Does the same thing with 3.20 or 6.22. I tried a similar action on another PC and it fails immediately. It makes me wonder if it is a floppy controller IC level difference where the one used in the Tandy allows a format command without returning an error or something. The disk is NOT formatted though. It goes through the motions, but in the end, all the file data is still present.