I bought the 16BG hard drive with my Mini 9, as you can see from the picture below. What I received from Dell was a 4GB install of Mini OS. Thanks Dell, I don't need the 8GB of extra hard drive space I specifically paid for.
I quickly ditched Mini OS and installed Ubuntu 8.10 Beta. Look at the difference:
To check your hard drive partitions
In a terminal type:
sudo fdisk -l
And, don't worry UbuntuMini.com has your back. You can learn how to make a LiveUSB and then install Ubuntu properly onto your Mini 9. - Install guide HERE