BIOS - CSM setting changed

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  1. Posts : 68
    Windows 10 Pro v1803 17134.191
       #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.
      My ComputerSystem Spec

  2.    #2

    Is it installed as UEFI or Legacy ?
      My ComputersSystem Spec


  3. Posts : 68
    Windows 10 Pro v1803 17134.191
    Thread Starter
       #3

    UEFI, thats what setting CSM to never does?
      My ComputerSystem Spec

  4.    #4

    biker66 said: View Post
    UEFI, thats what setting CSM to never does?
    CSM = Compatibility Support Module, that's needed for UEFI and practically means same thing.
      My ComputersSystem Spec

  5.    #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.
      My ComputersSystem Spec


  6. Posts : 68
    Windows 10 Pro v1803 17134.191
    Thread Starter
       #6

    whats the secure boot option for? (its enabled by default i think). that option only appears when set to Windows 8?
      My ComputerSystem Spec

  7.    #7

    biker66 said: View Post
    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
      My ComputersSystem Spec


  8. Posts : 68
    Windows 10 Pro v1803 17134.191
    Thread Starter
       #8

    ok i'll check i have it enabled next time i reboot.
      My ComputerSystem Spec

  9. Caledon Ken's Avatar
    Posts : 13,346
    Windows 10 Pro x64 Build 1809
       #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.
      My ComputerSystem Spec


  10. Posts : 68
    Windows 10 Pro v1803 17134.191
    Thread Starter
       #10

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


 
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