I've installed NetBSD 1.6.1_Stable on a disk that used to be
part of a raid array.  Unforunately the installer doesn't clear
the old raid information, and since the array was configured
with Autoconfigure, the newly-installed system gets confused,
and then can't even run /bin/sh.  Sigh.

What can I do to either

1) Remove the old raid info from the disk, or
2) Stop the kernel trying to autoconfigure a non-existent
   raid?

I prefer 1) as 2) is just delaying the problem.

Neil.