Show added disk:

# geom disk list

Create GPT:

# gpart create -s gpt /dev/ada1

Check GPT:

# gpart show ada1

Create partition:

# gpart add -t freebsd-ufs /dev/ada1

Check:

# gpart show ada1

Format partition:

# newfs /dev/ada1p1
# mkdir /media/hd2
# vi /etc/fstab

Add string:

/dev/ada1p1    /media/hd2    /ufs    rw    1    1

# mount /media/hd2/

Check disk:

# df -h