Squarified treemaps show what's taking up so much space on your hard drive

I've found it very helpful to use "squarified treemaps" to get a quick visual sense of what the big space-wasting files are on my hard drive. Even large groups of small files stand out in highlighted boxes (e.g. the yellow frame in this screenshot is around my 7.3GB C:\WINDOWS directory). Thanks go to Edward Ianuzi for suggesting this helpful utility!

• In Windows I first tried SequoiaView 1.3 but now I use WinDirStat (a Windows port of KDirStat).


• On the Mac I first tried GrandPerspective but now I use Disk Inventory X which is a Mac-native adaptation of KDirStat.


• For X11 (UNIX/Linux, etc.) there is KDirStat which has a 3-pane display of summarized/browsable folder sizes, summary by file types, and the squarified treemap.