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How is fragmentation calculated?

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I just downloaded Defraggler and analyzed a (non ssd) hard drive. According to defraggler there is 31% fragmentation.


The Windows 10 build-in defragmentation tool states the same drive with 0% fragmentation.


Why is there such a gap between those two tools?


Thank you for clarification.



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Defraggler sees locked microsoft files which windows ignores their effect on the fragmentation. At least that's how I understand it

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