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Date: Tue, 28 Oct 2008 10:21:00 +0000
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Subject: Zero-Fill format before installation
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I have a remote machine with KVM access that I'd like to format and
reinstall FreeBSD 7.0. I've succeded in formatting /dev/ad6 but not the main
drive, /dev/ad4.
Is it possbile to zero-fill format during the installation instead of simply
deleting and recreating partitions?

I've tried booting into single user mode without any success:
# umount -a
umount: /cdrom: not a file system root directory
umount: /var: not a file system root directory
umount: /usr: not a file system root directory
umount: /tmp: not a file system root directory
# dd if=/dev/zero of=/dev/ad4
dd: /dev/ad4: Operation not permitted