WinDirStat is a port of KDirStat for Linux. It’s free, lightweight, small (650kb installer), fast, portable (as a standalone .exe file), and works on multiple versions of Windows. Besides showing folders and percentages (for the entire disk or any subset of folders), it also displays an (optional) graphical usage map. Works well with NTFS Junction folders, avoiding counting folders multiple times.
SpaceSniffer is another possibility. It can scan Alternate Data Streams (ADS) and correctly ignores junctions. However, it is not hard-link aware. If a file has multiple links, they will show up in the scan more than once. I’ve personally tested all this information to be accurate on Windows XP as of version 22.214.171.124.
TreeSize is pretty sweet.
Its advantage over the others is that on NTFS drives, it works on the MFT (Master File Table) and reaches extremely high scan speeds.
The free version doesn’t have fancy visualizations and reports but should be sufficient in most cases.
JDiskReport (also available for Mac OS X and Linux).
I tend to stick with Scanner. I occasionally try programs with more features, but I find Scanner does everything I actually need.
I like FolderSize, since it’s integrated into Explorer and caches the results.
You always know how much space a folder is taking, and can easily identify space hogs. It’s always there, so you don’t have to start a separate program.
It’s old, but I really like the tree map view in SequoiaView.
SequoiaView is free and happily works all the way up to Windows 7 and Server 2008.
I’d recommend Disk Space Fan. It has a similar UI to Scanner or Overdisk, but looks more fashionable. Current price for a single license in 15$.
With Sysinternal suite, you have du.
I like it, because it is command-line, very lean and fast. And it is free 🙂
C:\>du somedir Du v1.33 - report directory disk usage Copyright (C) 2005-2007 Mark Russinovich Sysinternals - www.sysinternals.com Files: 28618 Directories: 2625 Size: 671,672,063 bytes Size on disk: 671,672,063 bytes C:\>
There are many possibilities, but in my opinion the best programs to show file system usage are: WinDirstat, Scanner, Xinorbis and SpaceSniffer.
- JDiskReport (requires java)
The older edition of SpaceMonger is minimalist and functional.
While WinDirStat shows a similar view, I prefer the higher contrast, visiblity of SpaceMonger when I want to quickly view the state of my drive.
DiskView is very handy. It has both the pie chart visualization as well as usage bars on the folder tree. It’s integrated directly into Windows Explorer.
WizTree is free and can read directly MFT, so in contrast to most other programs it scan in seconds.
I’ve always used OverDisk (web search). Simple and effective.
- OverDisk’s old URL (http://users.forthnet.gr/pat/efotinis/programs/overdisk.html) appears to be dead
- other questions indicate OverDisk is incompatible with Windows 10
SizeReporter is a tool I wrote that comes with no GUI. The main trigger for creating this tool was to have a way to run a disk space reporting application under a service and get raw data only. Further processing and own reporting/diagramming can then be done in a custom way by using other Software. I was amazed that for Windows I could not find anything free that actually fit my needs.
The tool is not actually really spectacular but can deal with many quirks and issues on filesystems (bad timestamps, very long paths, junctions, …). “du” (sysinternals) was the tool I used in the past but delivers only a summary.
I hope this can also be useful to others.
FolderSize.Win32 is ultimate one. You can use the scroll button to peek in and out of folders and easily find out any deep nested folder which is consuming lot of space.
Shows everything visually. Very very nice.
I see WinDirStat has been given a few mentions already – so I’ll just throw ShowMan into the mix.
I like the display of ShowMan better than WinDirStat, as it’s cleaner to look at. However – ShowMan is not free for commercial use (and for that reason, I have been using WinDirStat more recently).
It seems every disk space analyser under the sun has been listed and the one with the most votes hasn’t had a new release since the question was asked seven years ago!
I recommend Folder Size Explorer, one of the newest and simplest disk space analyzers that can quickly display which folders are using the most disk space and also export the list for printing. It has the same familiar functionality as the built-in Windows Explorer so it’s very intuitive.