Operations Manager 2007 and Essentials 2007 / 2010 are great for monitoring logical disk free space, and provide a great deal of flexibility in defining your thresholds, but what do you do AFTER you get an alert that a disk is filling up? How do you identify the top consumers of disk space? I found the perfect FREE (as in beer) tool called WinDirStat that will analyze drive contents and show you which file types are consuming the most space on a drive. Not only does it show you a list of file types and space consumed, it give you a visualization of the drive, with little squares and rectangles of data, sized according to the amount of data consumed on the disk (see image below)
I have used this tool to analyze even the largest volumes with more than 2 terabytes of data. It supports everything from Windows 2000 to Windows 2008 and even works on mapped drives! It’s free and open source (on SourceForge.net).
You can download WinDirStat at http://www.windirstat.info
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