Windows 10: Can't mound ISO files after windows update.

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  1. Posts : 1,683
    Windows 10 x86 14383 Insider Pro and Core 10240
       1 Week Ago #21

    Disk defagmenters do not always manage to defragment all individual files, especially when the files are multi-GB ones.

    Windows defrag rarely can defrag large files in a single pass - because when Windows is running, many files are open and not able to be moved, defragmented or deleted - interfering with the consolidation of a large file that may be fragmented by the intercalation of active files.

    A boot-time defragmenter will defrag all files usually because Windows has not loaded yet and the majority of files are not opened.

    Puran Defrag is one such example and also can defragment individual files on demand from the right-click menu.

    Individual file defragmenters are also available from Neosmart and are used in the EasyBCD utility for defragmenting ISO files and VHDs:

    From: EasyBCD


    UltraDefrag is an excellent individual file defragment utility that can be used to quickly group all clusters of a single file. EasyBCD relies on this feature to prepare disk images for booting.
    The following files in the EasyBCD distribution are derived from this package and governed by its license:

    • bin/udefrag.dll
    • bin/udefrag.exe
    • bin/udefrag-kernel.dll
    • bin/zenwinx.dll

    License: GPL v2
    Source Code: ultradefrag-4.4.0.src.7z

    Another defragmenter that can defrag individual files is Contig from Microsoft Sysinternals:

      My ComputersSystem Spec

  2.    4 Days Ago #22

    Thanks Kari and Fafhrd
    I might uninstall that update, because I'm still suffering form missing drives issue. Which I thought this update solved it.
    Getting sick of windows errors/lose files after sleep/restart...
      My ComputerSystem Spec

  3. Posts : 625
    Windows 10 Pro IP Build 15063.483
       2 Days Ago #23

    Sounds your issue is related to file permissions caused by the latest update.

    The system does not have the correct permissions to access the images. As copying the files helps solve the issue, make a copy of any of the non working ISOs and then compare permissions on both. You should see some differences. For instance instead of seeing the System "user" or Administrators "group" as one of the entries in the security tab, you instead see a GUID (a long name consisting of numbers and letters separated by dashes). This means that that particular user/group with that particular GUID does not exist in your system anymore. This issue is caused by bad update/migration of the registry values during the windows update process.

    This is a common issue that has happened to me multiple times when updating the system to latest builds/cumulative updates.

    Of course the issue could be related to something completely different too.
      My ComputersSystem Spec

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