Windows 10: Enable/Add Data Dedup to Windows 10? Solved

  1.    29 Jul 2015 #1

    Enable/Add Data Dedup to Windows 10?

    Hey all,

    I went ahead with the Windows 10 Upgrade to my main PC. I have a secondary drive (E:) which holds all my music, games, etc; stuff that I like to keep away from a Windows Install. In Windows 8.1 I had the Windows Deduplication enabled on the whole drive. Now, I cannot access any files whatsoever on that drive. Since it's something that constantly works in the background, I forgot about it until I really needed it.

    My Question: Is there a way to enable or add Windows Deduplication into Windows 10 yet? The only info I found was from this article (in 2014):

    It's for the Technical Preview. I followed the steps anyway, and I get an error while trying to add the packages:

    Error: 0x800f081e
    The specified package is not applicable to this image.

    If it is not possible, is there a way I can revert and undo the Upgrade and go back to my Windows 8.1 setup? Or do I have to wipe the drive and clean install?


      My ComputerSystem Spec

  2.    01 Aug 2015 #2


    I'm having the same issue, any help is appreciated.
      My ComputerSystem Spec

  3.    02 Aug 2015 #3

    Never found an answer, so here's what I ended up doing:

    I reverted back to 8.1 (using Settings -> Update & Security -> Recovery tab) and then I ran the Unoptimization job type in Dedup on the volume (E:). This took about 16 hours to restore 350GB and a restart to get everything back to their full file sizes (time will depend on your own storage/file sizes).

    Once that was finished, I did a clean install of Windows 10. All files are accessible.
      My ComputerSystem Spec

  4.    29 Apr 2017 #4

    Hello, I have found a program to activate Data Deduplication for Windows 8, 8.1 and 10.

    Weblink is:
    Direct download is:

    They deliver a free license to register the program...
      My ComputerSystem Spec


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