I'm trying to mess around with bitcoind (just the daemon) in a Virtualbox Ubuntu installation. So after installing bitcoind in the virtual installation it downloads the blockchain which is about 5 GBs. Suddenly I started running out of storage on my laptop though.
I checked the size of the Virtual install:
kramer65-Laptop:VirtualBox VMs kramer65$ du -sh *
22G Ubuntu server 13.10
I then checked the contents of the virtual image, which seems to be a lot less. In fact this is the total system (screenshot because it's a virtual server in which I cannot select the text):

I tried restarting, reinstalling (both bitcoind as well as a couple new fresh installs of Ubuntu 13.10 as well as 12.04), but to no avail.
Does anybody know why there is such a large difference between the file system it's size and the virtual image it's size?
[EDIT]
Here's a screenshot of what's inside the /proc folder:
