First you must format the hard drive (e.g. with fdisk, see
). If your new HDD is /dev/sdb, you can use
Let's say you've created a partition /dev/sdb1 on it:
Afterwards you can mount it, e.g.:
mount /dev/sdb1 /new_hdd
You can also create an entry in /etc/fstab if you want to have the new HDD mounted automatically whenever the system is booted.
And afterwards you can apply quota to /dev/sdb1, as shown in the Perfect Setup (of course, you must adjust the paths).