if the faulty drive is hdb, then use :
dd if=/dev/null of=/dev/hdb bs=512 count=1
be carefull with that.
if you do that on the drive where the os is, you'll lose the partition table.
so check twice before you hit enter.
btw, you can make a backup of your MBR on a floppy, use.
:
dd if=/dev/hda of=/mnt/floppy/bootsector.bak bs=512 count=1
sync
egag
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