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Date: Sun, 9 Sep 2012 19:48:26 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Kevin Oberman <kob6558@gmail.com>
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	(wonkity.com [127.0.0.1]); Sun, 09 Sep 2012 19:48:26 -0600 (MDT)
Cc: questions@freebsd.org
Subject: Re: Removing UFS label from root
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On Sun, 9 Sep 2012, Kevin Oberman wrote:

> I added a label to my root fs some time ago. I really prefer the gpt
> label and I have added it, but I can't figure out how to remove the
> ufs label.
>
> I boot single user and run 'tunefs -L "" /dev/ada1p2' but I get an
> "unable to write superblock" error. This is before mounting the drive
> RW, but it is, of course, mounted RO.

This worked in a VM when I tested it just now.  Maybe running fsck on 
that filesystem first will help.