Unsupported Disk Layout for UEFI firmware

Page 1 of 7 123 ... LastLast

  1. Posts : 106
    Microsoft Windows 10 Pro 64-bit 19041 Multiprocessor free
       #1

    Unsupported Disk Layout for UEFI firmware


    1803 will nt install. I get an error message saying I have an unsupported disk layout for UEFI firmware. The OS is on an MBR disk. Does this mean I have to make it a GPT?
      My Computer


  2. Posts : 29,970
    Windows 11 Pro x64 Version 22H2
       #2

    Hi BobZ

    Sounds like you are doing a clean install. Is that correct?

    Yes your disk has to be GPT to clean install if you want to boot UEFI. Please ensure you have your personal data backed up before following steps below.

    Boot with your media, on the first screen that appears press Shift + F10 to get command prompt. This will wipe your disk.

    diskpart
    List disk
    select disk 0 (ensure zero is where you want to install, change to appropriate disk number)
    clean
    Convert gpt (if required for UEFI)
    exit
    exit

    It is a good idea to just have your boot disk connected when installing, then connect other disks.

    When doing a clean install please see this tutorial for BIOS recommendations.

    Clean Install Windows 10
      My Computer


  3. Posts : 106
    Microsoft Windows 10 Pro 64-bit 19041 Multiprocessor free
    Thread Starter
       #3

    I haven't started a clean install. I was trying to find out what I should do. I have other things on the disk beyond the OS -- apps, etc.
      My Computer


  4. Posts : 4,594
    Windows 10 Pro
       #4

    Exactly how are you trying to update to 1803 ?
      My Computers


  5. Posts : 15,357
    Windows10
       #5

    Most modern pcs can boot into uefi or legacy bios depending in setting in the bios.

    If set to UEFI, drive needs to be set to GPT, and if legacy bios, device needs to ve MBR.

    However, some PCs are clever enough to boot from either MBR or GPT regardless of the bios setting i.e. bios setting may be UEFI but it will boot from an MBR drive.

    However, when you come to upgrade or reinstall, the installer tries to use GPT if bios setting is set to UEFI and detects drive is MBR and fails with your message.

    First thing to try is change bios setting to legacy bios, and it should work ok.
      My Computer


  6. Posts : 4,594
    Windows 10 Pro
       #6

    Don`t make any changes to anything until you tell us EXACTLY how you are trying to update to 1803.
      My Computers


  7. Posts : 106
    Microsoft Windows 10 Pro 64-bit 19041 Multiprocessor free
    Thread Starter
       #7

    The machine tried to update to 1803 and I got that message. I tried to update manually from the Windows Update setting and got the same message. That is all I've done.
      My Computer


  8. Posts : 4,594
    Windows 10 Pro
       #8

    OK, go into the Bios and set the Boot option/mode or however we want to word it to Legacy Mode.

    Very strange you are getting that message if nothing was touched in the Bios.

    It should just update.

    Can you boot into windows ? Did it revert back yo 1709 ?

    It would be great if you could post a shot of Disk Management, that would really help.
      My Computers


  9. Posts : 15,357
    Windows10
       #9

    As I said earlier, if bios is set to uefi but pc is clever enough to boot from a legacy bios install with bios set to uefi, then you sometimes get this error mesage as the upgrader detects bios is set to uefi but drive is mbr but thinks it has to be GPT. Setting bios to mbr should sort issue, assuming drive is mbr formatted. You can check drive format in disk management.
      My Computer


  10. Posts : 106
    Microsoft Windows 10 Pro 64-bit 19041 Multiprocessor free
    Thread Starter
       #10

    I can boot into Window and it did revert to 1709.

    Unsupported Disk Layout for UEFI firmware-screenshot-2018-05-17-14.12.12.png
      My Computer


 

  Related Discussions
Our Sites
Site Links
About Us
Windows 10 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 10" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd
All times are GMT -5. The time now is 13:59.
Find Us




Windows 10 Forums