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  1.    19 Dec 2015 #1
    Join Date : Nov 2015
    Posts : 40
    windows 10

    Dual boot Windows 10 32 bit and Windows 10 64 bit


    Hi

    I have win10 64 installed on my SSD and win10 32 bit on a HD. The SSD is GPT partitioned and the HD MBR. I can boot from the Windows boot loader in the BIOS into 64 bit windows on the SSD and, by selecting the appropriate HD in the BIOS into the 32 bit windows in the HD. I cannot figure out how to get that boot menu (either gui of text based) that I have read about in the forums. Do I need to convert the HD to GPT as well. Do I need to change anything to get this to work?

    Thanks for any advice and ask if you need clarification.
      My ComputerSystem Spec
  2.    19 Dec 2015 #2
    Join Date : Feb 2015
    Posts : 3
    Dual Boot 10 Pro v1607 10 Pro rs2 build 14971

    The only restriction that I know of is that you have to boot from the GTP disk. From an elevated command prompt on your GTP disk. type bcdboot D:\Windows where D is the drive letter of the HD disk. You will want to use bededit to change the descriptions in the boot menu since both will be windows 10 otherwise. This is from the tutorial forum. Operating System Name at Startup - Change in Windows 10 - Windows 10 Forums .
      My ComputerSystem Spec
  3.    20 Dec 2015 #3
    Join Date : Nov 2015
    Posts : 40
    windows 10
    Thread Starter

    Thanks JohnC. I was away yesterday so have yet to try this later today. But it looks like I will be fine. Another thing, I noticed that although my BIOS mode was UEFI when I started this, since I added the new MBR HD drive and OS, the mode has changed to LEGACY. Will it change back if I convert the HD to GPT? If not, how do I get my BIOS mode to revert to UEFI? Maybe an inplace upgrade?

    I will post my results later on today.

    Thanks JohnC.

    Quote Originally Posted by JohnC View Post
    The only restriction that I know of is that you have to boot from the GTP disk. From an elevated command prompt on your GTP disk. type bcdboot D:\Windows where D is the drive letter of the HD disk. You will want to use bededit to change the descriptions in the boot menu since both will be windows 10 otherwise. This is from the tutorial forum. Operating System Name at Startup - Change in Windows 10 - Windows 10 Forums .
      My ComputerSystem Spec
  4.    20 Dec 2015 #4
    Join Date : Nov 2015
    Posts : 40
    windows 10
    Thread Starter

    I did as you suggested. Booted into the GPT drive and added boot files to Windows Boot Manager and changed the names. So far so good. But when I rebooted the computer, the BIOS entry UEFI Windows Boot Manager which I previously used to boot into to start 64 bit windows is no longer there. I can see the GPT drive in the BIOS status screen and if I select it to boot, I cannot boot from it. I can only boot into the mbr HD drive. Obviously something is not right but I cannot figure this out.

    Entering bcdedit on the HD drive shows a windows boot manager section and a windows boot loader section pointing to the C; partition, which is the right partition that I am booted into. The other partition shows up as d:.

    Please ask for clarification if necessary but right now I can only boot into the mbr HD drive.

    As it stands I am stuck in the 32 bit windows with no way of accessing my 64 bit.

    Thanks.

    Quote Originally Posted by falkunmalti View Post
    Thanks JohnC. I was away yesterday so have yet to try this later today. But it looks like I will be fine. Another thing, I noticed that although my BIOS mode was UEFI when I started this, since I added the new MBR HD drive and OS, the mode has changed to LEGACY. Will it change back if I convert the HD to GPT? If not, how do I get my BIOS mode to revert to UEFI? Maybe an inplace upgrade?

    I will post my results later on today.

    Thanks JohnC.
      My ComputerSystem Spec
  5.    20 Dec 2015 #5

    To copy boot files for both EFI and MBR to the bootloader, specify the /f ALL parameter.
    eg: bcdboot C:\Windows /s C: /f ALL
      My ComputerSystem Spec
  6.    20 Dec 2015 #6
    Join Date : Nov 2015
    Posts : 40
    windows 10
    Thread Starter

    One question, Superfly.

    Given my situation that I cannot boot into the GPT drive, do I enter this command in an elevated command prompt in my mbr HD drive?

    My system drive is c: and the other drive is d:. Please excuse me but I don't want to make another mistake and make matters worse!


    Quote Originally Posted by Superfly View Post
    To copy boot files for both EFI and MBR to the bootloader, specify the /f ALL parameter.
    eg: bcdboot C:\Windows /s C: /f ALL
      My ComputerSystem Spec
  7.    20 Dec 2015 #7

    The MBR Boot folder has both types of boot files - so it doesn't matter...
      My ComputerSystem Spec
  8.    20 Dec 2015 #8
    Join Date : Nov 2015
    Posts : 40
    windows 10
    Thread Starter

    I tried this and I get an error saying could not open the BCD template store. Status [c000000f] What is wrong?
    Quote Originally Posted by Superfly View Post
    To copy boot files for both EFI and MBR to the bootloader, specify the /f ALL parameter.
    eg: bcdboot C:\Windows /s C: /f ALL
      My ComputerSystem Spec
  9.    20 Dec 2015 #9

    Seems BCD is corrupt try this:

    attrib c:\boot\bcd -h -r -s
    del c:\boot\bcd
    bootrec /rebuildbcd

    Then run bcdboot again.

    PS: If all else fails, you have a 64 bit UEFI (hopefully it is 32 bit) that can't boot from the 32 bit boot files - in which case these commands can be run from the 64 bit install media recovery options.
    Last edited by Superfly; 20 Dec 2015 at 17:09.
      My ComputerSystem Spec
  10.    20 Dec 2015 #10
    Join Date : Nov 2015
    Posts : 40
    windows 10
    Thread Starter

    Sorry, I guess I mistyped previously. So I entered the command exactly as indicated. This time the command executed successfully but I still can only boot into my mbr HD by selecting the drive at BIOS. If I select my SSD in BIOS, the computer does not boot. Also, Windows Boot Manager does not appear as an option in the BIOS, which I think it should, no?
    Quote Originally Posted by falkunmalti View Post
    I tried this and I get an error saying could not open the BCD template store. Status [c000000f] What is wrong?
      My ComputerSystem Spec

 
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