Hello, I am having this really weird issue with one of my disk partitions. D is an individual drive of 1 TB, as seen in the image it says I have about 30 GB left free space. However when i click inside, highlight everything including the hidden files, it only calculates to about 500 GB. So I have round about 400 GB of disk space that is there, but somehow taken and I dont know what is taking it. Any ideas ?