TreeSize Free is a program that allows you to check where data is located on your hard drive.

As we might have problems keeping track on hard disk usage and junk files, TreeSize can help finding out what directories are the biggest and most troublesome. It can be started from context menu of a folder or drive and it shows you the size of this folder, including its subfolders. You can expand this folder in Explorer-like style and you will see the size of every subfolder. Scanning is done in a thread, so you can already see results while TreeSize Free is working. The space, which is wasted by the file system can be displayed and the results can be printed in a report.