Fastback disk aren't true DOS format disks. Fastback writes raw to
disks, but puts a directory structure on them so a DIR from DOS
looks okay. They also use their own bootblock. I think that if you
reformat the disk using MSDOS, it should be okay.

-- 
Dave Cornejo                                There is nothing so subtle
Dogwood Media                                           as the obvious
Fremont, California

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