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  1. Joined : Aug 2015
    Posts : 123
    Windows 10 Pro 64bit
       01 Sep 2015 #1

    Booting a Win 10 DVD in UEFi Mode for Windows installation


    How do I set my BIOS to have the DVD boot and install Windows 10 in UEFI mode? I do see a setting on my Asus motherboard UEFI "CSM Compatability" and in there are three options:
    UEFI and Legacy OPROM
    Legacy OPROM only
    UEFI only

    Do I select UEFI only option here?

    What is the benefit of installing in UEFI vs Legacy? All I understand is that the system sets up more partitions.
      My System SpecsSystem Spec


  2. Joined : Aug 2015
    Posts : 123
    Windows 10 Pro 64bit
       01 Sep 2015 #2

    Anyone? :-)
      My System SpecsSystem Spec


  3. Joined : Jul 2015
    Posts : 6,898
    Windows 10 Pro
       01 Sep 2015 #3

    Try UEFI only. Full UEFI will allow for the system boot disk to be partitioned with GPT rather than MBR. The biggest advantage of GPT over MBR is the ability to create more than 4 primary partitions and have partitions over 4tb in size. Being able to have more than 4 primary partitions allows greater flexibility in boot options into recovery and troubleshooting partitions or booting into multiple operating systems.

    If UEFI only doesn't work, what you will likely get when you try to boot is just a flashing cursor on a black screen (that's what mine does, anyway). Then you can try Both UEFI and Legacy. Finally if that doesn't work, then Legacy only.
      My System SpecsSystem Spec


  4. Joined : Aug 2015
    Posts : 123
    Windows 10 Pro 64bit
       01 Sep 2015 #4

    Ok, thanks, like you I get the flashing cursor. I was able to get UEFI booting with the USB ISO but I gave up on the USB option as my Windows seemed to end up with all sorts of problems. Have installed from A Windows 10 Pro DVD now, just have the one partition plus the customary system partition. I don't mind not have multiple partitions on my primary (C drive as I have. 3 disk system.
      My System SpecsSystem Spec


  5. Joined : Jun 2015
    Posts : 1,614
    Windows 3.1 to Windows 10
       01 Sep 2015 #5

    a uefi install creates 4 partitions - only three are shown in disk management
      My System SpecsSystem Spec


  6. Joined : Oct 2014
    Posts : 107
    Windows 10
       01 Sep 2015 #6

    GregH said: View Post
    How do I set my BIOS to have the DVD boot and install Windows 10 in UEFI mode? I do see a setting on my Asus motherboard.....
    You do not need to change the UEFI firmware (BIOS) settings.

    Quote from this post: http://www.eightforums.com/installat...tml#post414211

    Asus motherboard with UEFI firmware. How to install Windows 7/8/10 64-bit in UEFI Boot Mode.

    Note: You need to select to boot from the UEFI type (marked UEFI in the boot menu) if you want to install Windows 7/8/10 64-bit in UEFI Boot Mode (see screenshot below).

    Note: You do not need to change the boot order of drives in your UEFI firmware settings.
    - Connect your Windows 7/8/10 64-bit USB flash drive (Note: FAT32 file system) or insert your Windows 7/8/10 64-bit DVD.
    - Restart the computer.
    - Press the correct key to enter the boot menu (for example, Asus F8 and Gigabyte F12).
    - Select to boot from the "UEFI: USB/DVD device name" (see screenshot below).

    Click image for larger version. 

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    Kyhi said: View Post
    a uefi install creates 4 partitions - only three are shown in disk management
    Click image for larger version. 

Name:	Windows 10 UEFI-GPT.png 
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ID:	35178
      My System SpecsSystem Spec


  7. Joined : Aug 2015
    Posts : 123
    Windows 10 Pro 64bit
       01 Sep 2015 #7

    Thanks genet - seems so simple in the end. I was digging in all dark corners of my firmware looking for this. F8 would have done it.

    Will my system run slower now that I have installed in legacy mode?
      My System SpecsSystem Spec


  8. Joined : Oct 2014
    Posts : 107
    Windows 10
       01 Sep 2015 #8

    GregH said: View Post
    Will my system run slower now that I have installed in legacy mode?
    No.
      My System SpecsSystem Spec


  9. Joined : Aug 2015
    Posts : 123
    Windows 10 Pro 64bit
       01 Sep 2015 #9

    That's a relief. Thanks!
      My System SpecsSystem Spec


  10. Joined : Jun 2015
    Posts : 1,614
    Windows 3.1 to Windows 10
       01 Sep 2015 #10

    Sorry Genet,
    That is not disk management - that is windows PE
    Disk management does not show the Reserved partition

    Or was that as proof of 4 partitions, not sure why qouted..
      My System SpecsSystem Spec


 
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