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    I've upgraded my Windows 8.1 Pro to Windows 10 Enterprise Edition and I can see that a folder Called RecoveryImage is created in my C: . It includes a Drivers folder, OEMInformation, DONOTREPLACE.txt, Install.wim (3.25 GB).

    The text in DONOTREPLACE.txt is

    Upgrade will not replace the on-disk recovery image if this file is present. Do not delete or modify this file.

    Build ID: 9841.0.amd64fre.fbl_release.140912-1613

    This folder is created when I was upgrading. It takes up nearly 4.00 GB of hard disk? What is the purpose of it? Does it's a Recovery Image of my previous Windows 8.1 Pro? That means can I be able to roll back to Windows 8.1 Pro?

    From my guess, I thought that Recovery Image is used to Rollback to previous version of windows if any problem occured during my upgrading process. So shall I delete that folder?

    Saturday, October 11, 2014 12:04 PM

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    Hi krnaveen14,

    This is result of recovery image, which should be used for Windows 10 Technical Preview.

    Currently, to recovery to previous system, refer to this information:

    If you want to go back to your previous operating system

    You'll need to reinstall your version of Windows from the recovery or installation media that came with your PC (typically DVD media). If you don't have recovery media:

    • For Windows 7 or Windows Vista: Before you update, you might be able to create recovery media from a recovery partition on your PC using software provided by your PC manufacturer. Check the support section of your PC manufacturer's website for more info.
    • For Windows 8.1 or Windows 8: You might be able to create a USB recovery drive. For more info, see Create a USB recovery drive.

    Alex Zhao
    TechNet Community Support

    Thursday, October 16, 2014 2:28 AM
    Moderator

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    hope this will help to understand more about it

    http://www.howtogeek.com/167984/how-to-create-and-restore-system-image-backups-on-windows-8.1/

    Saturday, October 11, 2014 6:24 PM
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    I don't think I would delete that folder or contents.   Its the recovery image, windows will use it to do some of the refresh/repair installs when you get into trouble.   Much faster than using the original install.iso for a reinstall and redoing settings manually sometimes.

    Also you might need that folder too - Earlier today or yesterday I used that install.wim with the dism command to repair a problem it found.   You can run Dism commands off that wim as source.     You wont have a full sxs source anywhere else otherwise that will work easily.

       Look at the date&times on the folders and files and you might see if windows has used it after the initial install.  It has on mine.



    • Edited by 'Mike P Saturday, October 11, 2014 11:40 PM
    Saturday, October 11, 2014 11:29 PM
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    When you upgrade your system to 10 all 8.1 and file history is deleted and replaced with 10. That recovery is if you have to recover from a system crash. Reset. If you did not do a backup of windows 8.1 you will have to setup your system from the installation media, or a backup.

    http://windows.microsoft.com/en-US/windows/preview-faq?OCID=Welcome_r_IPP_Body_BYInstall_10#faq=tab0

    If you want to go back to your previous operating system      

          You'll need to reinstall your version of Windows from the recovery or installation media that came with your PC (typically DVD media). If you don't have recovery media:



    • Proposed as answer by colakid Sunday, October 12, 2014 2:11 AM
    • Edited by colakid Sunday, October 12, 2014 2:12 AM
    Sunday, October 12, 2014 2:08 AM
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    Hi krnaveen14,

    This is result of recovery image, which should be used for Windows 10 Technical Preview.

    Currently, to recovery to previous system, refer to this information:

    If you want to go back to your previous operating system

    You'll need to reinstall your version of Windows from the recovery or installation media that came with your PC (typically DVD media). If you don't have recovery media:

    • For Windows 7 or Windows Vista: Before you update, you might be able to create recovery media from a recovery partition on your PC using software provided by your PC manufacturer. Check the support section of your PC manufacturer's website for more info.
    • For Windows 8.1 or Windows 8: You might be able to create a USB recovery drive. For more info, see Create a USB recovery drive.

    Alex Zhao
    TechNet Community Support

    Thursday, October 16, 2014 2:28 AM
    Moderator
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    I installed win10 tp   via the insider signup .iso onto my laptops win8.1pro-x64.

    Just Curious - What is difference between the 2 shown in my wim.

    Index:1   Windows Technical Preview       

    Index:2   Windows Technical Preview for Consumer

    Friday, October 17, 2014 2:50 PM
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    My problem is that the recovery image is huge.

    In my case it has 40 GB, out of which 38 GB are drivers, most of them various versions of NVidia drivers, at 400 MB each.

    The recovery image shouldn't contain stuff that can easily be downloaded from Windows Update in my opinion. Let alone multiple versions of it.

    I mean, WTF is this, really:

    Sunday, May 17, 2015 10:34 PM