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incorrect MFT size

ragno
2010-04-03
2012-09-12
  • ragno
    ragno
    2010-04-03

    UltraDefrag 4.2.0 shows an incorrect MFT size in some of my partitions.

    For example: 197.83 Mb, 9.99 Gb, 62.50 Gb and 49.65 Gb.

    For the same partitions, Windows Disk Defragmenter reports respectively: 105
    MB, 13 MB, 80 KB and 336 KB.

    The MFT sizes calculated by Windows seems much more consistent with the
    partitions usage.

    (I never used UltraDefrag before, so I don't know if older versions behave
    differently)

     
  • Stefan Pendl
    Stefan Pendl
    2010-04-04

    On my Win7 x64 the difference to Windows defrag is always 200MB, which UD is
    displaying more.

     
  • ragno
    ragno
    2010-04-04

    (I use UltraDefrag with Windows XP Professional SP2, and the 4 partitions use
    NTFS)

     
  • Alan Jones
    Alan Jones
    2010-04-06

    stefanpe,

    Are you saying that it is normal to see a different size? 200MB difference is
    a fair amount.....

     
  • Stefan Pendl
    Stefan Pendl
    2010-04-06

    Other tools are only reporting the used MFT size, where UD reports the total
    MFT size.

    On a freshly installed WinXP pro SP3 the used MFT size is 20MB, where the
    total MFT size is 2.5GB.

    Dimitri is currently working on making this more obvious for the user.

     
  • ragno
    ragno
    2010-04-06

    I have read some docs, and found that the MFT size reported by UD is the size
    of what Microsoft calls "MFT Zone", that is well explained here: http://suppo
    rt.microsoft.com/kb/174619

    So that value is neither the used size nor the total size: it is the reserved
    size.

    Now that I know this, I prefer the way UD display that reserved size, as
    Windows Disk Defragmenter display that zone as empty, but doesn't move files
    there...

    I would only write "MFT reserved" in the box, instead of only "MFT".