How to add new disk?

[GrobovoI]

How to add new disk?
mount /dev/ad4/ /mnt/ - not work. –--> mount: /dev/ad4 : Invalid argument
pfsense 2.0.3

[jimp]

Is that disk formatted at all?

Wipe the disk's old partitions

dd if=/dev/zero of=/dev/ad4 count=2 bs=1k

Give it a basic partition table

fdisk -BI ad4

Give it a disk label

bsdlabel -w ad4s1

Format the partition

newfs -L myextradrive -U /dev/ad4s1

Mount it

mount -t ufs /dev/ufs/myextradrive /mnt

You can then add a line for that to /etc/fstab to make it come back at bootup.  (At least on a full install, NanoBSD isn't quite that easy)

[GrobovoI]

Thanks, it works.
but i can't do automount
/etc/fstab:

/dev/ufs/pfsense0 / ufs ro,sync,noatime 1 1
/dev/ufs/cf /cf ufs ro,sync,noatime 1 1
/dev/ufs/ad4 /mnt ufs rw,sync,noatime 1 1

in dmesg no errors
mount -a work properly

P.S. Sorry for my bad english