Moving / recreating EFI partition

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  1.    12 Apr 2018 #11

    Since you have still the original EFI partition
    You would just have to assign the drive letter S to that partition and then format that efi partition
    then run bcdboot

    Reading your post - you created another EFI partition
      My ComputerSystem Spec

  2. Posts : 1
    Windows 10 64bit
       01 Jul 2018 #12

    I know this thread is a little old, but I created an account and just wanted to say Thank You, Kyhi!

    Fixed me right up. For anyone wondering, I did this with Windows booted to the desktop, and it worked just fine. In my case, I had the EFI System Partition on the HDD instead of my SSD, which is apparently an issue when you install Windows 10 with both drives connected.

    Kyhi said: View Post
    - Boot the computer using the Windows 7/8/8.1/10 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    list disk
    select disk # Note: Select the disk where you want to add the EFI System partition.
    list partition
    select partition # Note: Select the Windows OS partition (# number) or your data partition.
    shrink desired=100
    create partition efi size=100
    format quick fs=fat32
    assign letter=s

    list partition
    list volume Note: Note the volume letter where the Windows OS is installed.

    bcdboot X:\windows /s S:
    Note: Replace "X" with the volume letter of the Windows OS partition.

    BCDBoot copies the boot files from the Windows partition to the EFI System partition and creates the BCD store in the same partition.

    Remove the Windows installation media and restart the computer into your BIOS settings and set the SSD as the First Boot Device.
      My ComputerSystem Spec

  3.    22 Aug 2018 #13

    You need to set the new EFI System Partition's ID in diskpart or you won't be able to update windows (even though it will boot)!

    set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
      My ComputerSystem Spec

  4.    23 Aug 2018 #14

    Why not just copy the EFI from old drive to new drive using minitool partition wizard free - done it zillions of times.
    Last edited by cereberus; 26 Aug 2018 at 16:31.
      My ComputerSystem Spec

  5.    13 Oct 2018 #15

    Thank you for this guide!
    I tried a bunch of different methods online however none worked for me until i found this.

    I installed windows to an SSD while a data HDD was plugged in. The EFI partition for some reason got put on the data hdd.

    bcdboot X:\windows /s S:
    Note: Replace "X" with the volume letter of the Windows OS partition.

    For me C was my ssd while G was my HDD. I used "bcdboot C:\windows /s S:"
    Thanks kyhi!
      My ComputerSystem Spec

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