free space missing

Take a look at this screen shot: http://www.flickr.com/photos/31695551@N03/2966101635/

Free space is 59,xxx,xxx,xxx bytes -> 55.5 GB

Used space is 8,9xx,xxx,xxx bytes -> 8.9 GB

It just doesn't seem to add up or I am missing something really obvious.

Btw, great product.

It's normal, and mine is the same:

t429_Drivesizes.jpg

It's explained here: (more or less)