Okay so i wend and download Defraggler and defragged one of my Data Drive (Non-OS).
It took about a day i think, then it was done.
However one file had been added during the defrag (as i used it at one time) and this was of course fragmented, so i thought,
hmm one file should go fast as the others are defragged.
And well i started it. And that was about 16 hours ago, and it's at 63%, and now it has a lot more fragmented files.
My guess is that defraggler is moving in some kind of order, so it wanted to push that fragmented file somewhere else (let's say the beginning of the drive),
and by that it had to re-organize the entire file structure once again.
Just a guess though.
So any ideas, cause if this is the case, it's impossible to use this except like once a year.