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Best program to visualize file system usage on Windows?

Hi, I have about 2 terabytes of total space spread over several drives.. While I still have 500 GB free which should last quite a while I want to do some cleanup.

I'm not very organized and the directory structure is a total mess.. It would take days to go through everything, but according to the 80/20 rule 80% of the space is used by 20% of directories. How do I find them?

For example: C:\a - 200 GB C:\b - 111 GB

Then if I want to see the subdirectories of C:: C:\a\b - 140 GB C:\a\aaaa - 100 GB

..and so on.

Is there a builtin windows command / program or a 3rd party utility to do that?


WinDirStat was made for this task!

It'll show you exactly where your space is going.


TreeSize is another such application.

Treesize in action

  • You beat me to it by 52 seconds. I've deleted mine and +1'd yours. – Chris W. Rea Nov 13 '09 at 20:00
  • I'd like to add that this looks a little safer than WinDirStat from a security perspective. I haven't looked at the code, though. But WindDirStat has to be downloaded from one of a few shady looking sites. This is downloaded right from the developers website. – user875234 Nov 19 '18 at 12:51

I like SpaceSniffer. Small, fast, and doesn't require an install.

  • 1
    +1 for posting at same time as me, and remembering to mention the zero install. This is another one to stick on a USB key full of tools – AdamV Nov 13 '09 at 20:50

Fans of the mighty Total Commander use the VisualDirSize plug-in.

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I like SpaceMonger.

No assumption graphical interface, The older version is free. Rightclick gives menu items 'delete','open', 'zoom', etc...

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And another one: Overdisk


I used to use Sequoia but started to find the look a bit dated, and it was flaky (especially if cancelled). Now prefer Spacesniffer, really intuitive to zoom in an a folder, zoom in again and so on, and be able to use back button to zoom back out to previous screen. Seems fairly quick too.


For viewing disk usage I prefer Steffen Gerlach's Scanner, for its innovative and visual pie display, and where each pie can be accessed by using click drilling and right-click menu.

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  • Pies and their stranger derivatives are horrible ways to compare chunks of data. I can't tell which purple wedge is larger for example – AdamV Nov 13 '09 at 20:42
  • You can by passing the cursor over it - it's indicated up left. Pies are the most visual for me, at least. – harrymc Nov 13 '09 at 21:26

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