From owner-freebsd-questions@FreeBSD.ORG  Wed May 12 06:21:33 2010
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From: Boris Samorodov <bsam@ipt.ru>
To: Leslie Jensen <leslie@eskk.nu>
References: <4BE9B41B.5020000@eskk.nu>
Date: Wed, 12 May 2010 09:37:49 +0400
In-Reply-To: <4BE9B41B.5020000@eskk.nu> (Leslie Jensen's message of "Tue, 11
	May 2010 21:46:35 +0200")
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Cc: freebsd-questions@freebsd.org
Subject: Re: Disk can't be found, boot stops at mountroot
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On Tue, 11 May 2010 21:46:35 +0200 Leslie Jensen wrote:

> System 7.2-RELEASE
> I made the first reboot after
> freebsd-update -r 8.0-RELEASE
> freebsd-update install
> and I'm now stuck at the mountroot> prompt that says trying to mount
> from ufs:/dev/ad0s1a
> ROOT MOUNT ERROR
> The command ? to list valid boot devices gives
> List of GEOM managed disk devices:
> cd0 ufsid/452b81499eec5ac8 ad0a acd0 ad0 fd0

Seems that your system is using a so-called "dengerously dedicated"
disk (mind "ad0a").

> I've tried
> ufs:/dev/da0s1a
> and
> ufs:/dev/ad0s1a

Try ufs:/dev/ad0a

> With no luck
> Any suggestions on how to get booted?

-- 
WBR, Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve