So who's using that? You can zoom in on any folder by expanding it, just as in Explorer, and then TreeSize Free displays the space used by all the subfolders.

Trying this out on a test PC revealed that our Program Files folder has swallowed up some 30GB.

Right-click a folder in Explorer, click TreeSize Free, and the program will open and display a list of all your subfolders, sorted according to how much drive space they're consuming. It pays to keep a careful eye on where your hard drive space has gone, then, and TreeSize Free is just the tool to help. Even navigating around in Explorer takes longer as the program has more work to do. The more files you have, the longer it takes to search your hard drive, to defragment it, and to scan for viruses, for instance. While they have a point, the reality is that hard drive clutter has a very real effect on your PC, no matter how much space you've got free.

There's no need, they say - you're not going to run out of space for a very long time. Some people think that a hard drive with hundreds of free gigabytes needs little in the way of management.

File tree size free