Windows 8 64bit About a week ago I set up a 50GB partition for Steam games. I underestimated how many games I would be installing (and thought I could add more space down the road if needed) and decided to add 100GB. I shrunk my C drive 100GB and now I have C:, a 50GB Steam partition, and 100GB of unallocated space. Problem is I can't extend the Steam partition to the unallocated space, but I can with C? The Extend Volume option is grayed out when I right click, but it works on C. How can I do this?