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This image has both 'Piriform Defraggler' and 'Windows built in defraggler'(also called 'Optimize Drives').

Piriform shows 10% fragmented and Windows shows 7%. A bit of a difference but not huge.

With the Windows defraggler, are the selected drives correct or should I just select (C: )?
And do I run a weekly or daily schedule? TBH I am not sure if its set as my default one so have never noticed it slow down my PC.

Or do I use Piriform Defraggler schedule?

Thanks!