There have been a lot of disk space analyzers floating around lately that help you identify space-hogging files and folders on your hard drive. Disk Space Fan has a pretty interface, WinDirStat is a classic favorite, and there are all kinds of other ones available that accomplish the same kind of task. Some provide unique ways to view the space usage of your hard drive, but one I’ve been using for awhile is TreeSize Free.
The interface of TreeSize Free is pretty straight forward as you can see in the screenshot above, but that’s a lot of what I love about it. If you upgrade to the professional version you’ll get a lot of the advanced visualizations, but I don’t find them to be necessary. The free version should be more than sufficient for the few times you’ll actually need to use it.
One thing that I wanted to point out, and something a lot of users don’t realize, is that there is a portable version available so that you can carry TreeSize Free with you wherever you go. To grab it head on over to the download screen and from the drop-down menu select the middle option, which identifies itself as a “Zipped Executable.” You should be able to take that and throw it on your USB drive, or just keep it tucked away somewhere so that you can just pull it out when you need it.
Portable TreeSize Free Homepage (Windows only; Freeware)