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Date: Thu, 08 Oct 2009 20:26:34 -0400
From: Tom Uffner <tom@uffner.com>
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To: David Ehrmann <ehrmann@gmail.com>
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Cc: FreeBSD-current@freebsd.org
Subject: Re: 8.0rc1 not recognizing partitions on EPIA SN
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David Ehrmann wrote:
> First, I tried to upgrade the normal way.  I built my own kernel and 
> installed it, but when I tried to boot it, I got a mountroot> prompt.  
> When I printed the devices, instead of seeing ad0s1a and friends, I saw 
> ad0a and ad0d (just those two for ad0).  I was still able to use the old 
> (7.1) kernel fine.  Thinking it was something to do with the upgrade, I 
> tried to do a reinstall.  I chose the default options, but once it got 
> to the "last chance..." screen, this happened:
> 
> Unable to find device node for /dev/ad0s1b in /dev!
> The creation of filesystems will be aborted.

this is becoming an FAQ for 8.0

the short answer is "dangerously dedicated" partitions are not supported
by the 8.0 installer. back up your data. zero the MBR & partition table
with dd, and re-slice & partition your disk. after the install, restore
from your backups.

search the freebsd-current archives for full details.