Disk Space Fan is a freeware disk space analysis tool for Windows, which displays disk space allocation in Ringschart. The Ringschart is composed of a set of nested rings around a central circle.
The central circle symbolizes the root folder. Each ring represents a level in the directory. Each subfolder or file is represented by a sector of the ring. Its angle being proportional to the size of the folder's contents, and painted with a different color to ease visualization. Files are painted in light gray color. Folder or file which is smaller than 1/180 of the size of root folder will be ignored.
The chart displays five levels. In case a folder in that last fifth level contains even more subfolders, this situation is pointed by presenting a curve close to the edge of that folder's ring sector. When the mouse pointer hovers on one of the folders in the graphic, it is highlighted and a tooltip appears with information about its name and size.
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