Free utility Disk Space Fan analyzes your hard drive usage to help you determine what's taking up space on your hard drive, representing it all with fancy visualization eye candy.
Disk Space Fan is one of many disk visualization tools, from the classic WinDirStat to DriveSpacio, Disktective, and others.
WinDirStat has always been excellent when it came time to visualize your hard drive usage and knock off space-wasting files, but it's not the most attractive tool in the toolbox.
Disk Space Fan does the same sort of disk analysis, but it's also very attractive in addition to being very functional.
Eye candy aside, its scans are fast, and it's Explorer integration allows it to open up any file or folder for a closer look.
You can click any slice to drill down further (and yes, it has fancy animated transitions when you do the clicking), and you can open or delete any file or folder directly from the app. This makes it extremely efficient as a file manager, too.
Disk Space Fan is a free download for Windows only.
A Pro version is available with a few more features, but the core features that make it great are available for free.
All-in-all, it is one complete utility to analyze the content of local drives and folders. The disk visualization with great animation manages to make it easy for users to sort out files and folders quickly.
It comes in both free and paid versions, the paid app has a build-in functionality to find duplicate files, allow users to apply filters, scan network path, save scan history, and more.
Take it for a spin and let me know how you like it.
It works on Windows XP, Windows Vista, and Windows 7, both 32-bit and 64-bit OS are supported.
Here's a tutorial how it works: LINK
A comparison between the free and Pro versions (inspired by Uvah's comment):