hard drive - how to tell whats eating my harddrive space?

Possible Duplicates:
Best free tool to find largest files and folders on a drive
Best program to visualize file system usage on Windows?

does anyone know a free software that will graph the directories on my hard drive and sort them in order of largest size?

or provide me a solution for me to quickly determine what drives/ files are consuming my hard drive space?

Answer

I've had really good luck with windirstat, if you're on Windows of course.