Why is there a difference between Defraggler and W10 defrag results?

[pserpas 0]

I ran Defraggler on W10.  Oddly enough, when I first started, I had 5% fragmentation and after I ran Defraggler it jumped up to 25%!  Anyway, Windows shows 0% fragmentation and Defraggler shows 24%.  What am I supposed to believe?

[mta 0]

perhaps the fragmentation has just occurred?  when was the last time you hit analyse for the Win10 defrag?

or maybe there is a difference between the files covered by both programs, like; pagefile, restore points, hibernation file temp files etc.

 

what settings do you run DF with?  and what sort of defrag process was performed?

 

when you ran DF and went from 5% to 25%, have you ticked Stop VSS and ticked Exclude restore points and Exclude hibernation file ?