Defraggler shows block as empty while really it contains directory. Very inconveniently!
I'm in the mindset now to not even want to look at the drive/defrag map in any defrag software, since it's kind of pointless because they're going to do what they want to do based on their algorithms.
As for the empty block showing, what I've noticed is one defrag tool can show an empty block, while another shows the block as containing data.
IMHO, it's better to show the block as containing data if it really contains data - let be even directory only.