Wouldn't formatting the floppy for a Mac work, making it unreadable to PCs?  At
http://desktoppub.about.com/cs/crossplatformpc/ there are a bunch of "shareware" and
"demo" utilities to format floppies for a Mac from your PC.  Maybe some are very
inexpensive, or have just the floppy-format utility free-forever.

On 6 Nov 2001 at 11:05, John Chin wrote:

> Can anyone recommend a small DOS-based utility that will write zeros to all sectors on a FLOPPY diskette?
>
> Alternatively, how about a DEBUG script that would overwrite the Boot sector and FAT of a floppy?
>
> I need a minimum-sized (and quick) utility that can run in a batch file to convert formatted 3.5" floppies to an UNFORMATTED state. I need to "blank out" diskettes for testing a student's ability to format a floppy.

Thank you.
David Jonathan Justman

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