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Why can't Ubuntu see any free space?

I have a hard drive that should have close to 40GB free. However, when I just restarted the computer, Ubuntu popped up with the notification stating that the drive has 0 bytes of space remaining.

When I run df -h I get the following output:

Filesystem            Size  Used Avail Use% Mounted on

/dev/sdc5             721G  684G     0 100% /media/Storage1

As you can tell, 684G + 0GB != 721GB, instead I should have 37GB available.

Running fsck /dev/sdc5 showed that there are no problems and nothing was recovered on the ext3 mount.

Where did my missing 30GB go? How can I get them back?