I have literally JUST installed Windows 7 on my 15" Retina MBP. When I made the bootcamp partition, I gave it 30GB of my 512GB SSD (Since I won't really be using it to store many files). I updated the drivers from apple and installed Chrome. That's it. Now it is telling me I have used 24GB of my 27GB (27, even though I partitioned 30). Please see attached file. What is causing this? How can I free up some space? Surely just the windows install can't be that big...? I don't want to have to repartition and give it more space. Help!