There are many possibilities, but in my opinion the best programs to show file system usage are: WinDirstat, Scanner, Xinorbis and SpaceSniffer.
- Xinorbis
- Scanner
- WinDirStat
- FolderSize
- SpaceSniffer
- overdisk
- JDiskReport (requires java)
- SequoiaView
limited
not free
not found
References: