hi,
i have a new fbsd-8.2 install (dual boot with win7, just desktop general use) 
on entirely ufs disk, and am not 
sure how to mount a zfs  formatted disk from a previous install, without 
loosing what is on there. (freebsd-zfs).

in short, the zfs disk was from a previous freebsd install, same version, just 
needed to wipe/reinstall, which was also
entirely ufs. To try out zfs i used a full separate disk, partiitoned and setup 
as freebsd-zfs through gpt, then created 
the pool specifying it. i.e   

zpool create foo /dev/ad10.

atm i dont have a pool at all and dont know if i use that command, if it will 
simple create one and mount ad10, 
retaining the data on it or whether that will just reinitialise, wiping the 
data in the process.

to avoid surprises, i have been looking around to see if u can create an empty 
pool (without specifying disk space or w/e),
then try the ‘add’ command instead, to add it there, but i dont see that thats 
possible so far; and i dont have spare space 
to use in creating a new pool.

so, is it entirely safe to use zpool create foo /dev/ad10 to mount it and 
retain data, or is there some way to create an empty pool?

thanks in advance
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