Software to see where my data is

I want a program that can tell me where all my data is and in what folder.



In the windows world I would Treesize.



Is there a software package that will do the same. I did find one, but it was made for OS 9 and wanted me to install extra software.



Thanks

Reply 1 : Software to see where my data is

There is a software called GrandPerspective (opensource):

GrandPerspective



It is similar.