Folder Size for Windows adds a new column to the Details view in Windows Explorer. The new column shows not only the size of files, but also the size of folders. It keeps track of which folders you view, and scans them in the background so you can see complete size of all files within the folder. It's very useful for cleaning up your disk. Once you get used to having that information available, a directory listing simply looks incomplete without it!
Don't switch to another program to see folder sizes. It's always there when you're viewing your folders (even in Open and Save file dialog boxes, you can change the view), and it's a great visual cue to help you find the one you're looking for. Not just for disk cleanup, but for any time you need to choose a folder.
No scanning phase before you can start. As soon as you display the Folder Size column, you'll see sizes immediately. Large folders will continue to scan in the background while you browse your folders.
Explorer will automatically update the folder size column in real-time. No more manual rescanning.
Background scans won't monopolize your disk. When Folder Size detects that other programs are doing a lot of reading to and writing from the hard disk being scanned, the background scanning will wait for the other programs to finish.
If you don't show the Folder Size column for a while, it won't forget what it's already scanned, but the background scanner doesn't stay active. It won't waste any CPU time maintaining the cache on your P2P sharing or gaming machine that's always changing files.
Folder Size for Windows runs on Windows 2000 and XP, though has been tested almost exclusively on Windows XP. Sorry, not Vista.
Folder Size for Windows is split up into three components: The service which caches folder size information and makes it available to other processes; a column handler shell extension that makes a column available to Windows Explorer using data retrieved from the service, and a control panel for configuration.
Folder Size for Windows is written in C++ using Microsoft Visual
Studio .NET 2003. See the source code!