I have used a magnetic tape bulk eraser designed for 1/4 tape. Can you find one of those (free) where you work? Rick Glazier PS: Do NOT do this to a Zip Disk and some other forms of Media. (They will be destroyed.) ----- Original Message ----- From: "John Chin" <[log in to unmask]> > 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. Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://freepctech.com