mkdir /mnt/ad0s2
mkdir /mnt/ad0s3
mount /dev/ad0s2 /mnt/ad0s2
mount /dev/ad0s3 /mnt/ad0s3
or change cmd "mount" to "mount_ext2fs" #mount_ext2fs /dev/ad0s2 /mnt/ad0s2
the string "ext2fs" is the filesystem of you linux it may be ext3
ms windows filesystem you can use cmd "mount_msdosfs" or "mount_ntfs"
#mount_msdosfs dev/ad0s2 /mnt/ad0s2
#mount_ntfs dev/ad0s2 /mnt/ad0s2