Utility to see directory content sizes in windows

[StarTech]

Is there a good utility program to easily see where the storage is being used in a disk?
My C particion in one of my systems is out of control and I would like to know what is causing it.

I run a search in google but most of the hits I got where novell or servers related threads.

 

[doan]

treesize

http://www.jam-software.com/freeware/index.shtml