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From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
Date: Thu, 31 Jan 2008 17:33:50 -0500
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"Darryl Hoar" <darryl@osborne-ind.com> writes:

> Greetings,
> am setting up gmirror and screwed up my fstab.  When rebooting,
> it complains until I tell it the root device:
> ufs:/dev/mirror/gm0s1a
>
> it boots up and dumps me into single user.  When I try to change
> /etc/fstab, it tells me that the parition is mounted read only.
>
> How can I get things so I can change the /etc/fstab file ?  

http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/admin.html#RCCONF-READONLY

> I looked on freebsd.org for a live cd, but didn't find one.

The install CD is bootable, and has a "fixit" mode.
But you would still need to mount your root partition writable...