Moving EFI partition to another drive

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  1. NavyLCDR's Avatar
    Posts : 16,812
    Windows 11 Pro
       #11

    Or just create a new EFI System Partition on disk 3 which requires no extra software to do.
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  2. Megahertz's Avatar
    Posts : 3,527
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #12

    NavyLCDR said:
    Or just create a new EFI System Partition on disk 3 which requires no extra software to do.
    Easy task for you and others.
    If OP is here, he needs help.

    Please give him the CMDs
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  3. NavyLCDR's Avatar
    Posts : 16,812
    Windows 11 Pro
       #13

    Megahertz said:
    Easy task for you and others.
    If OP is here, he needs help.

    Please give him the CMDs
    Code:
    diskpart
    select volume c
    shrink desired=100
    create part EFI
    format fs=fat32 quick
    assign letter=t
    exit
    bcdboot C:\Windows /s T: /f UEFI
    diskpart
    select vol t
    remove letter=t
    exit
    exit
    DO NOT CONTINUE if any of the commands above produces an error!
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  4. SIW2's Avatar
    Posts : 2,513
    trying to install win10
       #14

    heywoodg said:
    Does it matter where the EFI partition is located. It usually appears to the left of the Windows partition.
    If I shrink the Win 10 partition on Disk 3 to accomodate the EFI partition, it will end up on the right of the Win 10 partition.
    Is this okay?
    You can put it wherever you think it is not going to be in the way.

    I dont need a separate esp with this mobo. It finds the efi folder on the root of any partition.

    You could try it. Copy the efi folder from the 100mb partition on disk 4 onto your C partition.

    Then unplug disk4 and see what happens.

    This is very useful not only because it can boot windows from mbr disk in efi mode, more importantly can boot ntfs usb stick in efi mode. No need for the 4gb file restriction of fat32 usb stick.

    But it seems to still need fat32 usb stick to save bios screenshots onto.
    Last edited by SIW2; 23 Oct 2021 at 18:23.
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  5. Posts : 12
    Win 10
    Thread Starter
       #15

    steve108, I've taken your advise and created an image with Macrium Reflect. I have noticed it has taken the EFI partition from Disk4 and the Win10 partition from Disk3 which is what I want.
    Being a bit nervous about trying to create an EFI partition on the drive where my preferred Win10 is, is it possible to restore the the Macrium image which was created from two different drives to one single drive.
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  6. NavyLCDR's Avatar
    Posts : 16,812
    Windows 11 Pro
       #16

    If you have an image to restore anyway, then why not take the two minutes to run the commands I gave you? If they don't work, then restore the image.
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  7. steve108's Avatar
    Posts : 19,680
    19041.1466 - 2004/20H1 Pro x64
       #17

    heywoodg, @NavyLCDR knows this stuff much better than I do, so try their suggestion first.

    I'm honestly not sure if your proposal would work without needing further commands to make it work, but since you have Macrium Reflect backup images, you can try.
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  8. Posts : 12
    Win 10
    Thread Starter
       #18

    NavyLCDR
    entered the code you provided. I can see the new EFI partition on Disk3, 100MB Healthy (EFI) System Partition.
    I get an error when doing the bcdbboot bit: "failure when attempting to copy boot files".
    Made sure I used correct assigned letter, I can see it in file explorer.
    Moving EFI partition to another drive-211024-163151.jpg
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  9. steve108's Avatar
    Posts : 19,680
    19041.1466 - 2004/20H1 Pro x64
       #19

    heywoodg,
    You can try booting from a Macrium Reflect Rescue USB, then try the option to fix boot problems. It may fix this issue easily and painlessly.
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  10. NavyLCDR's Avatar
    Posts : 16,812
    Windows 11 Pro
       #20

    steve108 said:
    heywoodg,
    You can try booting from a Macrium Reflect Rescue USB, then try the option to fix boot problems. It may fix this issue easily and painlessly.
    That's exactly what I was going to suggest.
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