Basically i just got a new laptop and installed some small programs.. Put on some images and installed some games but im not seeing as much space on my hard drive as i should. I know that my harddrive isn't going to be the 120 gig it was advertized as ( its about 111 split into 2 partitions, main and recovery ) but have a look at the picture below.. I have highlighted the parts of intrest. For a start. The two red boxes don't add up to 100gb.. the blue box adds up to about 44 gig.. Not the 48gig that it's meant to be. I know there is a difference between the 'file size' and the 'size it takes up on the disc', but surely it shouldn't add up to 10 gig difference.

What do you guys think?