Unsupported Disk Layout for UEFI firmware

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  1.    16 May 2018 #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?
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  2. Caledon Ken's Avatar
    Posts : 11,600
    Windows 10 Pro x64 Build 1803
       16 May 2018 #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.

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

    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
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  3.    16 May 2018 #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.
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  4. AddRAM's Avatar
    Posts : 2,235
    Windows 7 Pro x64 Windows 10 Pro x64
       17 May 2018 #4

    Exactly how are you trying to update to 1803 ?
      My ComputersSystem Spec

  5.    17 May 2018 #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.
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  6. AddRAM's Avatar
    Posts : 2,235
    Windows 7 Pro x64 Windows 10 Pro x64
       17 May 2018 #6

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

  7.    17 May 2018 #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.
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  8. AddRAM's Avatar
    Posts : 2,235
    Windows 7 Pro x64 Windows 10 Pro x64
       17 May 2018 #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 ComputersSystem Spec

  9.    17 May 2018 #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 ComputerSystem Spec

  10.    17 May 2018 #10

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

    Click image for larger version. 

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      My ComputerSystem Spec

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