There are a couple of shade variations not in the Legend, although they are explained in the on line docs:
QUOTE
If a square is heavily fragmented, it will be dark red; if it's lightly fragmented, then it will be light red. Similarly, if an unfragmented square is mostly full of data, it will be dark blue. If an unfragmented square is mostly empty, it will be paler blue.
You can keep the Drive Map legend open while you work with Defraggler.
http://docs.piriform.com/defraggler/using-...g-the-drive-mapIt would be more useful I think to include them in the display. Something for an updated version maybe.