In the example above I was wondering what was taking so much space in the
folder "c:/files/epicent".
The diagram tells me that the "epicent" folder is 1.8 Gb (the blue rectangle
to the left). Epicent contains several subfolders (the rectangles to the right),
where the biggest is "misc" (1 Gb). The biggest subfolders under misc
are "demo
cd" and
"sample-data".
Since the rectangle sizes correspond to the relative sizes of the folders, smaller
folders are hidden, which makes it easy to identify the real culprits eating
up your disk space. You can then use the popup menu to delete folders that you don't need.