Pulled out hard drive and stuck in another machine. Error received:
Trying to mount root from ufs:/dev/ad0s1a
Manual root filesystem specification:
<fstype>:<device> Mount <device> using filesystem <fstype>
eg. ufs:da0s1a
? List valid disk boot devices
<empty line> Abort manual input
mountroot>
Boot messages reveal that hard drive has switched to:
ad4: 95396MB <Hitachi ....>....
mountroot> ufs:/dev/ad4s1a
/ is now mounted.
Need to mount /usr for some tools (eg. vi) (-w = write)
mount -wt ufs /dev/ad4s1f /usr
Update /etc/fstab with the new drive/partition locations
In this case change all /dev/ad0... to /dev/ad4...
If you get errors about read only filesystem:
mount /
This should remount / with rw