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 ....>....
/ 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:
This should remount / with rw