I am having the same problem, I have a 160G HDD and I am only getting around 137G. I origionally had Evox m7 Bios, but with that, my 6th partition still only had about 134G, and my 7th partition had 0G.
So, nimr0d, I reflached with both the Executer Bios's that you said in the earlier posts. 4981.06, and .67. Still, same issue on my harddrive.
Do I need to re format my HDD again? I originaly preped it with the HDD utility downloaded from this website. I even prepared it with 7 partitions.
What can you suggest?