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How can I determine disk usage statistics of a Windows PC?

You can determine disk usage statistics on a Windows machine with WinDirStat (Windows Directory Statistics).
WindirStat is a free, open source disk usage analyzer and cleanup tool for Microsoft Windows. The program scans disk drives and generates reports that show which directories and files are consuming the most space on the PC.

This can be useful when diagnosing hard drives that are almost full and you want to find unneeded files to delete.

WinDirStat is free software published under the GNU General Public License.

In general that means you are free to do whatever you like with the binary form (mirror it, put it on media accompanying printed magazines and also use it inside your company) free of charge.

Common questions:
How much disk space is being used?
What is taking up space on my hard drive?
Where is my space being used?

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