DiskAnvändning

DiskUsage shows graphically how the space on your volumes is utilized.
A useful tool to answer the question, "Where has all my disk space gone?".

After launching, DiskUsage shows only a white window with all mounted volumes as tabs at the top. You'll have to choose the one you're interested in and click Scan to start chugging through the disk. For larger disks this can take some time... While you wait, you may switch to a different tab and start exploring that volume or begin the scan process there as well.
It's not recommended to start several concurrent scan processes on the same physical disk, as the constant repositioning of the heads of the drive will only extend the wait.

The concentric circles represent different levels in the file system hierarchy. Above, the circle in the center represents the /boot/home/ folder. Each segment of the ring immediately outside that circle is a file or folder under /boot/home/. Every segment farther outside brings you one level deeper in the file hierarchy. You may have to resize the window to accommodate very deep folders.

As you move the mouse over a segment, information about that file or folder appears in the status bar at the bottom.

Right-clicking a segment offers a context menu to Get info, Open (with Tracker), Open with another suitable application or Rescan that particular folder.
Left-clicking a segment makes that file/folder the center circle.
Left-clicking the center circle moves you up one level.

You can drag files and folders from DiskUsage to other applications or to the Desktop or other Tracker windows for copying. Vice versa, dropped volumes and folders on DiskUsage's window will zoom directly to them, making them the new center circle.

You can also use the Tracker add-on from the context menu of any folder to start DiskUsage with that particular location.