The DiskView Visualizer in the bottom right shows the currently selected folder in Explorer in the form of a graphically rich pie or bar chart. System files/ ...
The treemap chart is a hierarchical chart that is able to visualize the sizes of each subfolder (not only direct child folders) of a selected directory branch.
The DiskSavvy disk space analyzer provides multiple types of statistical pie charts and timeline charts capable of showing the amount of disk space usage.
FolderSizes is a free, powerful, fast, network-enabled disk space analyzer and folder size reporting tool for Windows ... Disk space bar, pie, and treemap.
Imagine your file system, with its nested folders and subfolders, laid out in a circular, multi-level pie chart. That's essentially what a Sunburst Chart is.
The new release enables hardware acceleration for the charts which dramatically improves performance. The new charts will run at least three times faster.