BIOS - CSM setting changed

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  1. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
       New #1

    BIOS - CSM setting changed


    I have set my BIOS to disable CSM support as i want my drive to be GPT not MBR. if i don't disable CSM in the BIOS then even if i set the drive to GPT using diskpart, Windows install will change it to MBR type without telling me! my mobo is a "Gigabyte GA-Z77X-UP5 TH". I had the BIOS setting for OS to "Windows 8 WHQL". there is no info in the guide book about this particular setting. the other options are "Windows 8" and "Other". then i set BIOS CSM to never. The problem i've had and this has happened more than once is that the BIOS OS setting changed from "Windows 8 WHQL" to "Other" & i think CSM was enabled. Has Windows 10 done this or the BIOS? maybe its a software or hardware fault with the BIOS? another problem i've had is that a SATA drive port i had set to disabled was re-enabled. sometimes this would result in new drive letters appearing.
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  3. CountMike
    Posts : 19,518
    W11+W11 Developer Insider + Linux
       New #2

    Is it installed as UEFI or Legacy ?
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  4. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #3

    UEFI, thats what setting CSM to never does?
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  6. CountMike
    Posts : 19,518
    W11+W11 Developer Insider + Linux
       New #4

    biker66 said:
    UEFI, thats what setting CSM to never does?
    CSM = Compatibility Support Module, that's needed for UEFI and practically means same thing.
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  7. Steve C
    Posts : 7,904
    Windows 11 Pro 64 bit
       New #5

    When enabling secure boot, Gigabyte told me to use the Windows 8 option and not Windows 8 WHQL. I set that and UEFI only and all is fine.
    Last edited by Steve C; 19 Apr 2018 at 02:46.
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  8. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #6

    whats the secure boot option for? (its enabled by default i think). that option only appears when set to Windows 8?
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  9. CountMike
    Posts : 19,518
    W11+W11 Developer Insider + Linux
       New #7

    biker66 said:
    whats the secure boot option for? (its enabled by default i think). that option only appears when set to Windows 8?
    Secure boot | Microsoft Docs
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  10. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #8

    ok i'll check i have it enabled next time i reboot.
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  12. Caledon Ken
    Posts : 30,187
    Windows 11 Pro x64 Version 23H2
       New #9

    Could you please post a shot of disk management.

    Disk Management - How to Post a Screenshot of

    With CSM disabled it would force UEFI

    Attachment 185267

    For some reason your manual is missing several points found in other Gigabyte manuals. I pulled down several. I know there can be differences model to model but generally they are the same.
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  13. biker66
    Posts : 203
    Windows 10 Pro x64 21H2 build 19044.2130
    Thread Starter
       New #10

    the section in the mobo user's manual "BIOS - Peripherals" doesn't mention CSM nor the setting for Windows 8.
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