How can I visualize the file system usage on Windows?

How can I visualize which folders and files are taking up all of the space on my hard drive?

I'm getting some conflicting reports on the size of hard drive contents. Namely what is and isn't there and what folders are actually using the space.

I need to know which of the files or folders the culprits behind all this hidden bloat.

WinDirStat is a port of KDirStat for Linux. It's 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.

TreeSize is pretty sweet.

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.

I tend to stick with Scanner. I occasionally try programs with more features, but I find Scanner does everything I actually need.

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've always used OverDisk. Simple and effective.

There are many possibilities, but in my opinion the bests programs to show file system usage are: WinDirstat, Scanner, Xinorbis and SpaceSniffer.

Xinorbis

Scanner

WinDirStat

FolderSize

SpaceSniffer

overdisk

JDiskReport (requires java)

SequoiaView

limited

Disk Space Fan

not free

SpaceMonger

TreeSize

DiskView

not found

Drivespacio

References:

Overdisk alternatives

How can I visualize the file system usage on Windows?

Herramientas para analizar el espacio en disco

I've recently found another (rather unimaginative title) FolderSize software from MindGems:

There are freeware and portable versions here.