Yes, it can be bad diskette only.
Nothing else is possible now, because i tried : format the diskette, create blank image and rawrite it to diskette, rawrite boot image to diskette by program called...
Sorry ...
That's strange, I downloaded boot images from your website, and there is the same error! I'm using rawrite2 for dos running Windows XP SP2 and diskwriter for windows. Maybe bad programs?
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