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  1. #1
    ROG Member Array HGnDC PC Specs
    HGnDC PC Specs
    MotherboardASUS ROG Strix Z390-E
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    Memory (part number)CMK32GX4M2A2666C16
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    Storage #2Western Digital Black 6TB WD6003FZBX
    CPU CoolerCryorig H7
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    Power SupplySeaSonic FOCUS Plus Gold 650 W 80+
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    How to correct mistake: system disk is MBR and cannot boot to UEFI mode

    When installing Win 10 Pro on my newly built system (from a USB key purchased from Microsoft) I somehow managed to format the system drive (Samsung SSD 970 EVO NVMe m.2) as MBR instead of GPT. As a result, I can only boot Windows into Legacy BIOS Mode, not UEFI. I would like to fix this. I believe I will have to reinstall Windows from scratch. I know that there is a utility called MBR2GPT that can convert the drive from MBR to GPT, but since this is a brand new install, I don't mind starting afresh.

    What is the best way to go about this? This site (https://docs.microsoft.com/en-us/pre...6946(v=win.10)) says to:

    1. Turn off the PC, and put in the Windows installation USB key.
    2. Boot the PC to the USB key in UEFI mode.
    3. When choosing an installation type, select Custom.
    4. On the Where do you want to install Windows? screen, select each of the partitions on the drive, and select Delete. The drive will show a single area of unallocated space.
    5. Select the unallocated space and click Next. Windows detects that the PC was booted into UEFI mode, and reformats the drive using the GPT drive format, and begins the installation.

    Is this a good approach? I'm not sure I fully understand step 2. How can I be sure to boot my Strix Z390-E into UEFI mode? Should I clear the CMOS? Restore BIOS to default settings? On a forum for MSI motherboards I read that the way to ensure booting into UEFI mode was to "press <F6>, confirm, set "SETTINGS \ Advanced \ Windows OS Configuration \ Windows 10 WHQL Support"="Enabled." I understand that this procedure won't work on my ASUS board, but I would be grateful for a straightforward explanation of how to get my Z390-E to boot into UEFI mode.

    Thanks!



    Thanks so much for your advice.

    --Howard
    Last edited by HGnDC; 12-09-2018 at 05:37 AM.
    ASUS ROG Strix Z390-E | Intel i7-8700K | Corsair Vengeance LPX 32 GB DDR4-2666 | EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT | Samsung 960 EVO 500 GB M.2-2280 SSD | Western Digital Black 6TB | Cryorig H7 | Fractal Design Define R6 Gunmetal TG ATX | SeaSonic FOCUS Plus Gold 650 W 80+ | Windows 10 Pro 64-bit

  2. #2
    ROG Guru: Gold Belt Array Menthol PC Specs
    Menthol PC Specs
    MotherboardM 10 Apex / XI gene
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    Yes boot to bios F5 = default settings, F10 and save, span F8 to boot to boot selection select your USB drive with UEFI in front of the drive

    The steps you listed 1 - 5 is the correct

  3. #3
    ROG Member Array HGnDC PC Specs
    HGnDC PC Specs
    MotherboardASUS ROG Strix Z390-E
    ProcessorIntel i7-8700K
    Memory (part number)CMK32GX4M2A2666C16
    Graphics Card #1EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT
    Sound Cardonboard
    MonitorDell UltraSharp UP3017
    Storage #1Samsung 960 EVO 500 GB M.2-2280 SSD
    Storage #2Western Digital Black 6TB WD6003FZBX
    CPU CoolerCryorig H7
    CaseFractal Design -Define R6 Gunmetal TG ATX
    Power SupplySeaSonic FOCUS Plus Gold 650 W 80+
    Keyboard Logitech Y-RCP140
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    Thanks for your response. I'm still a little fuzzy on getting the computer to boot in UEFI mode. In addition to resetting the BIOS to default settings, shouldn't I also disable CSM (compatibility support mode)? At the moment CSM is set to "enabled."
    Last edited by HGnDC; 12-09-2018 at 04:23 PM.
    ASUS ROG Strix Z390-E | Intel i7-8700K | Corsair Vengeance LPX 32 GB DDR4-2666 | EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT | Samsung 960 EVO 500 GB M.2-2280 SSD | Western Digital Black 6TB | Cryorig H7 | Fractal Design Define R6 Gunmetal TG ATX | SeaSonic FOCUS Plus Gold 650 W 80+ | Windows 10 Pro 64-bit

  4. #4
    ROG Guru: White Belt Array MoKiChU PC Specs
    MoKiChU PC Specs
    MotherboardASUS ROG Strix Z370-F Gaming
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    Quote Originally Posted by HGnDC View Post
    Thanks for your response. I'm still a little fuzzy on getting the computer to boot in UEFI mode. In addition to resetting the BIOS to default settings, shouldn't I also disable CSM (compatibility support mode)? At the moment CSM is set to "enabled."
    Hi,

    Yes :

    - CSM (BIOS) : Disabled (Full UEFI)
    - Secure Boot (BIOS) : Windows UEFI Mode

  5. #5
    ROG Member Array HGnDC PC Specs
    HGnDC PC Specs
    MotherboardASUS ROG Strix Z390-E
    ProcessorIntel i7-8700K
    Memory (part number)CMK32GX4M2A2666C16
    Graphics Card #1EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT
    Sound Cardonboard
    MonitorDell UltraSharp UP3017
    Storage #1Samsung 960 EVO 500 GB M.2-2280 SSD
    Storage #2Western Digital Black 6TB WD6003FZBX
    CPU CoolerCryorig H7
    CaseFractal Design -Define R6 Gunmetal TG ATX
    Power SupplySeaSonic FOCUS Plus Gold 650 W 80+
    Keyboard Logitech Y-RCP140
    Mouse Logitech Y-RCP140
    Headset/Speakers PreSonus Eris E3.5
    OS Windows 10 Pro 64-bit
    Network Routerubee UBC1301

    Join Date
    Dec 2018
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    Thanks to everyone for their help. I managed to correct the problem by running the mbr2gpt utility to change the format of my boot drive from MBR to GPT, and then rebooting into the BIOS and disabling CSM and changing Secure Boot to WinUEFI mode. No data loss!
    ASUS ROG Strix Z390-E | Intel i7-8700K | Corsair Vengeance LPX 32 GB DDR4-2666 | EVGA GeForce GTX 1070 Ti 8 GB FTW ULTRA SILENT | Samsung 960 EVO 500 GB M.2-2280 SSD | Western Digital Black 6TB | Cryorig H7 | Fractal Design Define R6 Gunmetal TG ATX | SeaSonic FOCUS Plus Gold 650 W 80+ | Windows 10 Pro 64-bit

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