Directory Disk Usage, known as diruse is a free command line tool found on Microsoft's Help . Using diruse is easy. After you have downloaded the tool, install by clicking on diruse_setup.exe. After installing the program, open a command prompt and run:
cd "\Program Files\Resource Kit"
diruse /M /* c:\
where:
/M – reports in Magabytes
/* – Uses the top-level directories residing in the specified directory (In the above example C:\ is the specifed directory)
Below is the results of the output: