wiping the first few mb, else disklabel(8) could get confused
# dd if=/dev/zero of=/dev/rsdXc bs=1m count=2
partition the disk as needed
# disklabel -E sdX
for each partition, create file system
# newfs /dev/rsdXc
optional: give user user access to partition Y
# mount /dev/sdXY /mnt # chown user:wheel /mnt