The alternative is GdMap.
They both show grafically the used disk space.
Very usefull if you ask yourself: "What hapenned to that 250 GB HDD?"

SequoiaView is a disk usage

SequoiaView is a disk usage visualization tool for the Windows operating system. It uses cushion treemaps best unix hosting. SequoiaView is freeware,and has been developed at the Technische Universiteit Eindhoven best frontpage hosting. SequoiaView is the first implementation of squarified treemaps in hard disk visualizations. The use of cushions allows a greater cheap jsp hosting understanding of the hierarchical structure of the maps on a hard disk domain hosting review.SequoiaView inspired programs such as KDirStat and it's Windows-based version, WinDirStat.