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


  1. siepo
    Posts : 34
    Linux
       New #1

    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?
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  3. topgundcp
    Posts : 2,799
    Linux Mint 20.1 Win10Prox64
       New #2

    Instead of using diskpart. Use: mountvol command.
    For example, if letter A is assigned to the EFI partition in Windows then use: mountvol A: \D

    All mounted Devices are stored in the registry:HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
    and might contain entries that no longer used in Windows. Use: mountvol /R to remove those

    If the problem still persists then it must be caused by Linux.
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  4. zbook
    Posts : 41,481
    windows 10 professional version 1607 build 14393.969 64 bit
       New #3

    1) Open disk management > by default some columns are compressed > widen each Status and Volume > make sure the contents within the parenthesis are in full view and that none of the characters are cutoff > view disk 0 > widen this row as needed so that all of the characters are in full view > post an image into the thread
    Disk Management - How to Post a Screenshot of

    2) Download and install Minitool Partition Wizard > click launch > post an image of the results into this thread
    MiniTool Partition Wizard Free Edition - Free download and software reviews - CNET Download.com
    MiniTool Portable Partition Magic Brings Easier Disk Management

    3) Run disparinfo.bat
    Batch files for use in BSOD debugging

    Use this link as needed when posting results:
    How to Change Post Editor to Source or WYSIWYG Mode at TenForums.com
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  6. siepo
    Posts : 34
    Linux
    Thread Starter
       New #4

    topgundcp said:
    Instead of using diskpart. Use: mountvol command.
    Thanks, that did it!
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