I took advantage of that exact command, which also didn't work. Here's what did, ultimately:
First, I installed Linux and the GRUB bootloader, replacing the old BSD loader. A reboot indicated that my old boot loader was now gone and the GRUB boot loader was in charge.
Second, I booted a LiveCD and wrote /dev/zero to my first drive using, as suggested: dd if=/dev/zero of=/dev/ad0 bs=512 count=1
Finally, I installed FreeBSD 7 and my problems were solved.
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