Windows 10: Disk boot order not correct in UEFI

Discus and support Disk boot order not correct in UEFI in Windows 10 Support to solve the problem; My machine, MSI Titan GT80S SLI "Skylake" sometimes takes over a min to boot and sometimes just 30 seconds, weird. I wonder if the boot sequences as... Discussion in 'Windows 10 Support' started by dictum, Feb 4, 2019.

  1. dictum Win User

    Disk boot order not correct in UEFI


    My machine, MSI Titan GT80S SLI "Skylake" sometimes takes over a min to boot and sometimes just 30 seconds, weird. I wonder if the boot sequences as defined in UEFI has something to do with it.

    It does not look right. The first disk that appears there, 860 EVO, is not the primary boot disk. Neither is the second one, PM951. The one at the bottom (option 5 and 6) is PM981 that is the primary Win10 boot disk and that defined in the bcdedit.





    Disk boot order not correct in UEFI xsnGhKQ.jpg




    This is how the it's seen in Disk Management. PM981 is the disk 0 or C:. That's the primary boot disk.

    Should it not show up in the UEFI as the first disk (option 1 and 2)?





    Disk boot order not correct in UEFI tYFLWtn.jpg



    This is how bcdedit looks (Via EasyBCD)


    Disk boot order not correct in UEFI YUjicpx.jpg


    And that is the actual boot menu resulting from bcdedit configuration. It is correct.
    There are 3 bootable disks in the system right now, the boot disk can be selected by scrolling up/down and hitting enter. All that works but that still raises the question why in UEFI the primary boot disk is not choice 1 which is the top, or default choice here. Could it be that the machine tries all the options until it gets to the correct one and that explains the slight timeout at times?


    Disk boot order not correct in UEFI m2QmFPt.jpg


    :)
     
    dictum, Feb 4, 2019
    #1
  2. dark2099 Win User

    AsRock Z77 Pro3 - AHCI? UEFI?

    UEFI is a new standard of bios design, so that would probably be what the BIOS has listed as the first boot option, where ACHI is a mode that SATA controllers run, and that is probably listing drives by order of first to last by port order. Not sure why it would list that way (if my guess is right as to how/why it is listing the drives).
     
    dark2099, Feb 4, 2019
    #2
  3. Unsupported Disk Layout for UEFI firmware


    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
     
    Caledon Ken, Feb 4, 2019
    #3
  4. Disk boot order not correct in UEFI

    Unsupported disk layout for UEFI firmware

    I hear you on configuring your own PC the way you choose to.

    His PC could not boot to a GPT disk if in Legacy BIOS mode. It could not boot to an MBR disk in UEFI mode. The error tells us that his disk is not partitioned for UEFI, so he is in Legacy BIOS mode, on an MBR disk, but has UEFI/GPT capability. On a Legacy
    BIOS-only PC, like my 2007 Dell XPS laptop, it would not give this error.

    You are right that we do not know which version Windows Update is trying to install. He might not be able to upgrade directly from version 1507/build 10240 to version 1709 (or 1803). I could do a test tomorrow to see if the upgrade can be done in one step.
    I think that it might have to be done in two upgrades via Windows Update (because 10240 cannot do a UUP Windows Update) but probably can upgrade in one step via mounted ISO.

    Using a downloaded ISO might also bypass this error, as I think you originally suggested, leaving the disk as MBR.
     
    Don Cuthbert, Feb 4, 2019
    #4
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Disk boot order not correct in UEFI

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