Windows 10: Unwanted drive letter for 2nd EFI partition: How to get rid of it?

Discus and support Unwanted drive letter for 2nd EFI partition: How to get rid of it? in Windows 10 Drivers and Hardware to solve the problem; My laptop (HP ProBook 4330s) contains an SSD with Ubuntu Linux and a HDD in a caddy with Windows 10 Pro, 2004 edition. Both are installed in UEFI mode,... Discussion in 'Windows 10 Drivers and Hardware' started by siepo, Sep 4, 2020.

  1. SIEPO
    siepo Win User

    Unwanted drive letter for 2nd EFI partition: How to get rid of it?


    My laptop (HP ProBook 4330s) contains an SSD with Ubuntu Linux and a HDD in a caddy with Windows 10 Pro, 2004 edition. Both are installed in UEFI mode, and each drive has its own EFI partition for its own OS.

    The caddy EFI partition gets an unwanted drive letter. I can make it go away with diskpart, but then it returns after a reboot. If I create a shortcut to a diskpart script in c:\programdata\microsoft\windows\start menu\programs\startup then I get an authentication request on login, which I do not want.

    Is it possible to make it go away permanently?

    :)
     
    siepo, Sep 4, 2020
    #1
  2. DAVEM121
    DaveM121 Win User

    2nd External Drive does not have a Drive letter

    Hi Neal,

    See if you can get rid of that first EFI partition before creating a new volume . . .

    Right click that first EFI partition on that drive, what options are on that partition?

    When stepping through that wizard, accept the Default Size, make sure file system is NTFS and accept the default Drive letter

    Your drive should then be visible and usable in File Explorer . . .
     
    DaveM121, Sep 4, 2020
    #2
  3. GEOB
    geoB Win User
    Drive letter for EFI system partition?

    In Macrium Reflect (free), a Dell Optiplex 3046 running 6.3.1835 on Win 10 64 Pro, returns a
    when performing a backup that includes the EFI system partition. Macrium's suggested solution is to assign a drive letter to that partition. The EFI partition is required for a disk image.

    Before I assign a drive letter I'd like to understand what risks there are in the assignment.
     
    geoB, Sep 4, 2020
    #3
  4. NAVYLCDR
    NavyLCDR Win User

    Unwanted drive letter for 2nd EFI partition: How to get rid of it?

    Drive letter for EFI system partition?

    The only risk is that it will give the user and programs access to the EFI System Partition through the drive letter to make changes. I doubt that assigning a drive letter will fix the issue because we do backups all the time with no drive letter assigned to the EFI System Partition, but you can try, and just remove the drive letter after the backup is done.

    The good news is that it is extremely easy to rebuild the EFI System Partition.
     
    NavyLCDR, Sep 4, 2020
    #4
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Unwanted drive letter for 2nd EFI partition: How to get rid of it?

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