Windows 8 and 8.1 Forums


Fragmentation Puzzle: How many ways can it be measured?

  1. #1


    Posts : 220
    Windows 8.1 Pro X64

    Fragmentation Puzzle: How many ways can it be measured?


    While playing with various defrag solutions I noticed a glaring difference in the fragmentation percentages reported by the analyse phase of each product.
    On my 100GB Windows C drive:-
    1. The built-in Windows 8.1 optimiser showed 0%
    2. Defraggler showed 9%
    3. Powersuite showed 31%
    4. Perfect Disk showed File fragmentation: 0.1% Free Space fragmentation: 7.9%


      My System SpecsSystem Spec

  2. #2


    Posts : 2,191
    Windows 8.1


    Hi again Hairy Scot,

    I do not believe there is any puzzle here because the determination of "how much" fragmentation is present is dependent on the parameters of the program being used. Some defrag programs may want to pack everything up to the front of the drive and establish consecutive sectors for each program; whereas, others may just want to move things around (as required) to make each program's sectors consecutive. Now, in my hypothetical example, I would have to believe that the one trying to pack everything up to the front with consecutive sectors would indicate much more defragmentation than the other.

    Also, some defrag programs may include a "most frequently used programs" parameter and others may not even give that parameter any consideration.
      My System SpecsSystem Spec

  3. #3


    Fragmentation Puzzle: How many ways can it be measured?
    As many as the people making the calculation.

    The calculation of the degree of fragmentation is not a simple thing. To do it at all a software product has to follow a set of rules considering many factors and make a number of essentially arbitrary decisions. There is no consensus on how to do this so each product has a different set of rules. It is to be expected that the results will be different, sometimes to a considerable degree.

    I have never found those fragmentation numbers to be very useful. Comparing the results of different products is virtually meaningless.
      My System SpecsSystem Spec

  4. #4


    Posts : 2,191
    Windows 8.1


    Quote Originally Posted by LMiller7 View Post
    Fragmentation Puzzle: How many ways can it be measured?
    As many as the people making the calculation.

    The calculation of the degree of fragmentation is not a simple thing. To do it at all a software product has to follow a set of rules considering many factors and make a number of essentially arbitrary decisions. There is no consensus on how to do this so each product has a different set of rules. It is to be expected that the results will be different, sometimes to a considerable degree.

    I have never found those fragmentation numbers to be very useful. Comparing the results of different products is virtually meaningless.
    Well stated!
      My System SpecsSystem Spec

Fragmentation Puzzle: How many ways can it be measured?
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