I have a 100gb hard drive. Right now I have two partitions. I just looked in Computer Management, and it says C: 55.30 GB NTFS, then next to it, is another group that says D: 37.20GB and one joined with that group saying 675 MB Free Space. What is this "Free Space?" When I right click it, only thing that I can select is "New Simple Volume" or "Help." I had UBuntu on and it made 2 partitions, and I delelted / merged the first one onto the c partition.