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Directory Sizes is a lightweight Windows tool created with the sole purpose of showing users the size of each folder on the local disks.

The plain and simple GUI seems to be the right choice for such an application because it groups the essential options right in the main window.

Users are thus required to choose the root folder and pick the drive to scan with just a few clicks. Directory Sizes lets you see folder size either from the local hard-drives, from CD-ROM, network or removable devices.

Once you hit the “Scan” button, Directory Sizes calculates the size of each folder and shows the disk content in a subtree layout. Right-clicking any of the displayed items lets you open the folder with Windows Explorer or simply expand it to see the size of each sub-folder that may exist.

What's more, the application sports a dedicated option that gives you the possibility to export the results to TXT and thus analyze the data at a later time.

While Directory Sizes is a very basic piece of software, it may slow down the system during the scanning process, especially if you select a larger folder.

A help section is also available, just in case rookies need more documentation on a specific built-in feature.

All things considered, Directory Sizes is a good piece of software, but there still are things to be improved here and there. The main window for example is not resizable, which is quite a serious problem when dealing with long folder names.