He's already installed gparted to format the "disc" as ext4. PySDM would not be my first choice since it's no longer maintained, makes too many mistakes, does not have a complete list of options, and has no idea what a UUID is.
Really, this isn't an NTFS partition where unless you use a template things can get a little confusing if you are new to this. It's an ext4 partition where a mount in fstab looks something like this:
UUID=076426af-cbc5-4966-8cd4-af0f5c879646 /media/Data ext4 defaults,noatime 0 2
But we are getting way too far ahead of ourselves. The OP never mentioned that he wants to have this partition automount. The original problem was that he never formatted the new disk. Wayne128's suggestion of gparted will fix that. As for having it automount he may be happy with the way it mounts through Nautilus.EDIT
: I have no idea why I just posted
It looks like this was marked as [SOLVED] before the last 2 posts.