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FreeBSD MountRoot Prompt

This is original from Beyond Revolution (http://mustaxe.blogspot.com/2007/12/dealing-with-freebsd-mountroot-prompt.html)


At the <mountroot> prompt you can type ? to get a list of devices which should also display ad0s1a. And thats what we are looking for. Then type (youll be taken to single-user mode so that you can fix the rest)
ufs:/dev/ad0s1a

In single-user mode, you can look at your current fstab file where the mount devices are specified.
# cat /etc/fstab

Then mount your /var, /tmp, /usr just like in your fstab but changing the disk number
# mount -t ufs /dev/ad0s1d /var
# mount -t ufs /dev/ad0s1e /tmp
# mount -t ufs /dev/ad0s1f /usr

You can confirm your mounts by typing either of these two commands:
# df
# mount -p

Make root writable so that you can update fstab
# mount -uw /

Update fstab with the correct disk IDs.
# vi /etc/fstab
Save it and reboot

Welcome back to your system! :)

Available link for download