what does /dev/ad0s use for ?

[Supote Leelasupphakorn]

Hi, all 

  In addtion to files named /dev/ad0sX (where "x" is
slice number) in /dev
those I can mount it usually, there is "/dev/ad0s1"
(has no partition label).

  My question is when and what this device file is use
for?

Thanks for any explaination.


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