This is the software publisher's description.

TreeSize Professional is a powerful and flexible hard disk space manager. Quickly find which folders take up the most space on your drive and recover megabytes of disk space.

TreeSize Professional shows you the size, allocated and wasted space, the number of files, 3D bar and pie charts, the last access date, the file owner, the NTFS compression rate and much more information for several folders or drives you choose.

TreeSize also allows you search for old, big and temporary files. The application has an intuitive Explorer-like user interface, it is fast and multithreaded and supports Unicode and scheduled scans.

You can print detailed reports or export the collected Data to Excel and to an HTML, XML or ASCII file. TreeSize Professional can be started from the context menu of every folder or drive.