's0' is the dummy slice for drives which do not have slice tables on
them. I usually format a slice table with fdisk.
e.g. (note: this completely destroys/reformats the hd):
fdisk -IB /dev/ad8
disklabel64 -r -w /dev/ad8s1 auto
disklabel64 -e /dev/ad8s1
(add 'd' partition covering the whole disk)
(newfs_hammer -L LABEL /dev/ad8s1d)
-Matt
