Convert Windows 10 from Legacy BIOS to UEFI without Data Loss  

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  1. Posts : 2,790
    Linux Mint 20.1 Win10Prox64
       #70

    @simrick
    [simrick;989599]There might be a way:
    Do a Macrium image of your C partition (verified).
    Clean install Windows.
    Boot to Macrium and copy the image of C back over the clean install C partition.
    That will get your partitions back to where they need to be.
    This will align all partitions as if you do a fresh install. One exception that you do not need to completely clean install. Please look at step 4 of this post:
    UEFI Win Clean install using Macrium reflect - Page 2 - Windows 10 Forums
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  2. Posts : 13,536
    Windows10
       #71

    topgundcp said:
    @simrick

    This will align all partitions as if you do a fresh install. One exception that you do not need to completely clean install. Please look at step 4 of this post:
    UEFI Win Clean install using Macrium reflect - Page 2 - Windows 10 Forums
    I do not see any recent posts by @simrick?
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  3. Posts : 16,278
    W10Prox64
       #72

    topgundcp said:
    @simrick

    This will align all partitions as if you do a fresh install. One exception that you do not need to completely clean install. Please look at step 4 of this post:
    UEFI Win Clean install using Macrium reflect - Page 2 - Windows 10 Forums
    Hmmm....the page has been removed?
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  4. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #73

    Here it is:

    topgundcp said:
    Asumming you already have:
    1) Windows Installation USB/DVD
    2) Macrium Rescue disk.

    Here's a step by step procedure:
    1. Create a backup image of the whole disk to another external/internal disk and don't forget to verify it.
    2. Boot up Windows installation disk, hold SHIFT+F10 to get the command Windows and type:
      diskpart
      list disk
      select disk # where # is the SSD of current Windows
      clean
      exit
      exit
    3. Click Next and select Custom then continue to install Windows, when get to the screen below, select the unallocated partition then click Next (do not format)
      Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-win10_pass4_load_driver_complete_final.png
    4. On next screen below. After getting the check mark on the first item, click on the red X to cancel the installation, turn off the PC:
      This should create:
      500MB Recovery, 100MB EFI System, 16MB and C drive with not much data in it, you will restore the original C drive on next step.
      Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-2_win10_usb_prep14.jpg
    5. Now boot up the Macrium Rescue disk, select the image from step 1, and select the SSD as destination disk.
    6. Click on C partition of destination then click on "Delete this partition".
    7. Drag and Drop the C partition from source to destination.
    8. Once done, click on "Fix Windows boot problems"
    9. Get into BIOS and select UEFI to boot from GPT disk.
    10. Boot into Windows, you are now running Windows with GPT disk.


    The procedure should not take long, 30 minutes at most. HTH.
    Last edited by Brink; 22 Oct 2017 at 16:30.
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  5. Posts : 16,278
    W10Prox64
       #74

    Thanks @Brink. Must be I don't have permission to view it then...
    And thanks @topgundcp - that's good to know!
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  6. Posts : 61,457
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #75

    The thread was removed since the OP was banned for getting abusive in it.
      My Computers


  7. Posts : 16,278
    W10Prox64
       #76

    Brink said:
    The thread was removed since the OP was banned for getting abusive in it.
    Oki doki.
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  8. Posts : 1
    Win 10
       #77

    Hoping for some help figuring out my issue.
    MBR2GPT is not able to validate my disk.
    The error says:
    Cannot map MBR partition type 238. Please supply custom mapping through the command line.
    First partition too close to the beginning of the disk. Should start at offset 17408 or above, found at 512

    Convert Windows 10 from Legacy BIOS to UEFI without Data Loss-untitled-01.jpgConvert Windows 10 from Legacy BIOS to UEFI without Data Loss-untitled-1.jpgConvert Windows 10 from Legacy BIOS to UEFI without Data Loss-untitled-2.jpg

    Any thoughts?
      My Computer


  9. Posts : 17,246
    Windows 11 Pro
       #78

    It's probably the GPT Protective Partition, but it is really weird that it is only a small part of the drive:
    How to Access GPT Protective Partition Without Losing Data Windows 10/8/7 - EaseUS

    Be advised, a lot of articles say to use the diskpart "clean" command. That command erases the ENTIRE drive - ALL PARTITIONS. If you don't have a backup of what you want to keep, it will get erased using the CLEAN command.
      My Computer


  10. Posts : 481
    Windows 10 Pro
       #79

    Worked just fine here. Thank you
      My Computer


 

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