mount 2nd HD containing running Freebsd system

[Fbsd1]

I have run out of space on my running 7.1 system. I have a 2nd HD 
containing 6.1 that I want to mount and use the 80gb /usr slice.

What is the mount command to use?
Thinking   mount /dev/ad1 /mnt  but un-sure how this handles the 6.1 
slices on that HD.
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