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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?

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marked as duplicate by ChrisF, Phoshi, Diago Nov 13 '09 at 22:05

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Quadruplicate, rather? –  JMD Nov 13 '09 at 20:11
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@JMD Triplicate, perhaps ? –  Sathya Nov 13 '09 at 20:34

8 Answers 8

up vote 9 down vote accepted

WinDirStat was made for this task!

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

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I've used this in the past and it works well, even though the gradients look so '90s. –  Ben S Nov 13 '09 at 19:58
    
You can also use SequioaView ( w3.win.tue.nl/nl/onderzoek/onderzoek_informatica/visualization/… ) –  schnaader Nov 13 '09 at 19:58
    
The gradients are... functional. I guess. –  Phoshi Nov 13 '09 at 19:59

TreeSize is another such application.

Treesize in action

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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 like SpaceMonger.

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

alt text

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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.

enter image description here

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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

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

alt text

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And another one: Overdisk

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

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+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

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.

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