Yes. Because you did not partition it as anything. You only format partitions that you have layed out and allocated to something. In your case, /boot 100MB / 29.9GB swap 1GB
Which is fine, but it's a little cleaner to split that 29.9GB up into /home, /usr, and /var But if you are already installed and running fine, no big deal.
So now you have 29GB of free space that you can use later if you need to. In your case, you might want to consider a backup partition on that second drive since all your real stuff is on the first HD. If HD 1 dies, then you have your data safely backed up on HD 2. But there is no need to partition and format disk apace just because it's there. Down the road, you might find something that you want it's own partition for.
Make sense?