Windows 10: Win10(GPT) / Win7(MBR) dual boot BIOS settings (Gigabyte Z170m-D3H)


  1. Posts : 16
    10 (& hopefully 7) Pro64
       16 Nov 2015 #1

    Win10(GPT) / Win7(MBR) dual boot BIOS settings (Gigabyte Z170m-D3H)


    I'd like to apologise in advance as this is probably completely newb to many of you.

    On the newegg page at the bottom of the review tab dated 8/25/2015 12:06:28 PM, Anonymous author stated:

    Other Thoughts: I'm not sure if other OEM's have this feature, but the UEFI BIOS allows you to exclusively enable your boot drive, so you can have multiple drives with distinct OS's, and when you choose to boot one, the others are auto-disabled.
    My Windows 10 boot SSD is GPT format while my Windows 7 boot SSD is MBR format with System reserved partition so IDK if this is even possible for dual booting?

    I don't get where the the settings on "exclusively enable and auto disable" are and how to apply them...

    Can anyone show screenshots of the settings to enable safe dual booting?

    Regards,
    David
    Last edited by GDavid; 16 Nov 2015 at 19:19. Reason: Trying to get title right
      My ComputerSystem Spec


  2. Posts : 16
    10 (& hopefully 7) Pro64
    Thread Starter
       17 Nov 2015 #2

    Would I be on the right path in thinking 2-4 of the manual (BIOS Features) is what this guy meant?

    Fast Boot
    Enables or disables Fast Boot to shorten the OS boot process. Ultra Fast provides the fastest bootup speed. (Default: Disabled)

    SATA Support
    >>All Sata Devices All SATA devices are functional in the operating system and during the POST. (Default)
    >>Last Boot HDD Only Except for the previous boot drive, all SATA devices are disabled before the OS boot process completes.

    This item is configurable only when Fast Boot is set to Enabled or Ultra Fast.
    Wouldn't this create a palava when trying to choose which OS to boot given Fast boot disables accessing BIOS with the Del key after posting?
    /confused
      My ComputerSystem Spec

  3.    17 Nov 2015 #3

    I think I might know what you're talking about. Its whereby you set the default boot device in BIOS and it *refuses* to boot from anything else. Had this issue, UEFI mobo would not boot from USB at any costs to reinstall windows when windows was already installed. So had to physically delete the OS drive from the boot entry list in the bios, make the USB the default and then it worked. And after windows was reinstalled, the USB drive was automatically removed from boot device options and the SSD re-added. I thought it was the weirdest thing, but this might just explain it. Cheers
      My ComputerSystem Spec

  4.    17 Nov 2015 #4

    GDavid said: View Post
    Wouldn't this create a palava when trying to choose which OS to boot given Fast boot disables accessing BIOS with the Del key after posting?
    /confused
    You'd get around this in Win10 by holding shift+restart when you are restarting from within windows, then going into UEFI settings from there, but from Windows 7 you would be screwed afaik.
      My ComputerSystem Spec


  5. Posts : 16
    10 (& hopefully 7) Pro64
    Thread Starter
       17 Nov 2015 #5

    Thanks for your replies Maltesespace

    Seems there is a Gigabyte App centre utility for controlling Fast Boot, called (funnily enough ) Fast Boot (Intel 100 series) link

    Works in W7&10x64
    Looks like I may be another step closer, considering how close I am to moving into the new build....

    Click image for larger version. 

Name:	Fast Boot in BIOS Features from section 2-4 of manual.JPG 
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    Click image for larger version. 

Name:	Gigabyte Fast boot utility.JPG 
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    Last edited by GDavid; 18 Nov 2015 at 00:14. Reason: Added first picture (I missed when posting)
      My ComputerSystem Spec


  6. Posts : 16
    10 (& hopefully 7) Pro64
    Thread Starter
       18 Nov 2015 #6

    Will have to install Win7 in EFI mode.
      My ComputerSystem Spec

  7.    19 Nov 2015 #7

    GDavid said: View Post
    Will have to install Win7 in EFI mode.
    Yes installing 7 in EFI mode is the best option. Before I upgraded to 10 I was running 7 Ultimate in UEFI mode and it was great.
      My ComputerSystem Spec


 

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