Moving EFI partition to another drive

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  1. Posts : 12
    Win 10
       #1

    Moving EFI partition to another drive


    I've ended up with this, the atatched image of Disk Management, don't ask why:
    Moving EFI partition to another drive-211022-165534.jpg
    I want to move the EFI partition from disk4 to disk3.
    Disk3 is the WIndows 10 installation I use but I want to remove Disk4 where the EFI partition resides.
    How risky is it using something like AOMEI Partition Assistant to achieve this.
    I definately don't want to loose the Win10 installation on Disk3

    Would be grateful for any suggestions
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  2. dalchina's Avatar
    Posts : 33,811
    Win 10 Pro (1903) (2nd PC is 21H2)
       #2

    Hi, example:
    Move EFI partition to another drive – Windows 10 | Ivan Tomica

    There are similar threads already answered on tenforums if you care to search tenforums for e.g.
    move efi partition
    Last edited by dalchina; 23 Oct 2021 at 00:46.
      My Computers

  3. steve108's Avatar
    Posts : 16,415
    19041.1348 - 2004/20H1 Pro x64
       #3

    Hello heywoodg and welcome to TF ,

    If you don't already have backups of your drives, most of us here recommend using
    Backup and Restore with Macrium Reflect

    I would suggest making a bootable Macrium Reflect rescue USB too before your start moving the EFI partition.
      My Computer

  4. steve108's Avatar
    Posts : 16,415
    19041.1348 - 2004/20H1 Pro x64
       #4

    I'm guessing you had Windows on Disk 4, then installed Windows on Disk 3 while Disk 4 was connected. The installation process saw the EFI partition on Disk 4, so it didn't create another on Disk 3. For this reason it is recommended to disconnect drives with other OSs when installing to a new drive.
      My Computer


  5. Posts : 12
    Win 10
    Thread Starter
       #5

    steve108
    It was a migration from Disk3 to Disk4 so obviously I couldn't disconnect any drive, I then decided to stick with Disk3 .
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  6. NavyLCDR's Avatar
    Posts : 16,588
    Windows 11 Pro
       #6

    If you still want to stick with Disk 3 all you have to do is shrink C: drive partition by 100 mb. Create an EFI system partition and add the boot files to the new EFI system partition with the bcdboot command.
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  7. SIW2's Avatar
    Posts : 2,370
    trying to install win10
       #7

    heywoodg said:
    steve108
    It was a migration from Disk3 to Disk4 so obviously I couldn't disconnect any drive, I then decided to stick with Disk3 .
    If you ever want to migrate again, it is best to choose something that will do the job properly.

    I use diskgenius for this task, it is excellent - free version does the job.

    Moving EFI partition to another drive-osmigrate3.jpg

    Moving EFI partition to another drive-osmigrate5.jpg

    Moving EFI partition to another drive-osmigrate7.jpg

    Moving EFI partition to another drive-osmigrate8.jpg

    Moving EFI partition to another drive-osmigrate10.jpg
      My Computer


  8. Posts : 12
    Win 10
    Thread Starter
       #8

    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?
      My Computer

  9. jimbo45's Avatar
    Posts : 11,020
    Windows / Linux : Arch Linux
       #9

    NavyLCDR said:
    If you still want to stick with Disk 3 all you have to do is shrink C: drive partition by 100 mb. Create an EFI system partition and add the boot files to the new EFI system partition with the bcdboot command.
    Hi there
    the easiest way --but you beat me to it !!!

    Cheers
    jimbo
      My Computer

  10. Megahertz's Avatar
    Posts : 3,321
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #10

    If you want to keep Win 10 on drive 4 you must copy the EFI partition to drive 3 (not move)
    - Open AOMEI Partition Assistant and make ~100M (unallocated space) at the beginning of drive 3.
    - With AOMEI Partition Assistant copy the EFI partition from drive 4 to drive 3.
    - Shutdown detach drive 4 (SATA or Power cable) and see if it boots from drive 3
    - If it does, open MSconfig - boot tab and delete the other boot option (drive 4)
    - Shutdown, detach drive 3 (SATA or Power cable) and attach drive 4.
    - Boot from drive 4, open MSconfig - boot tab and delete the other boot option (drive 3)
    On BIOS, set your boot priority.
    To boot from a non priority drive, launch boot menu.
      My Computers


 
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