410 - I've emailed you. Contact me and I'll send you a small utility that will zero out your MBR properly and completely (writes the first logical blocks of the drive with 00h pattern, startling at Cyl 0, Hd 0, Sec 1)
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Found another in the Mac archives and the link still works.
Goto
http://www.diydatarecovery.nl/ and download MBRTool(free) - they have some other nice stuff there too.