My tips for using Sysinternals’ Du.exe were well received last week, and my former coworker Charlie mentioned a GUI tool called Windirstat that I had completely forgotten about. For the command-line averse, it’s an incredibly useful tool.
But there’s one thing that Du.exe does that makes the CLI worthwhile. It will output to CSV files for further analysis. Here’s the trick.
DU -L 1 -Q -C \\SERVERNAME\C$\ >> servers.csv
Sub in the name of your server for servername. You have to have admin rights on the server to run this, of course.
For even more power, run this in a batch file containing multiple commands to query multiple servers, say, in your runup to Patch Tuesday. Open the file in your favorite spreadsheet, sort on Directory Size, and you can find candidates for cleanup.

David Farquhar is a computer security professional, entrepreneur, and author. He has written professionally about computers since 1991, so he was writing about retro computers when they were still new. He has been working in IT professionally since 1994 and has specialized in vulnerability management since 2013. He holds Security+ and CISSP certifications. Today he blogs five times a week, mostly about retro computers and retro gaming covering the time period from 1975 to 2000.
