Windows 10: Attempted 8.1/10 dual boot, only boots to 10

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  1.    07 Feb 2015 #1

    Attempted 8.1/10 dual boot, only boots to 10

    I followed the How To Geek's guide on how to dual boot - sort of. I was unable to shrink my Win 8.1 boot partition in disk manager- it kept telling me my disk didn't have enough free space, in spite of the fact that it should have had plenty.

    Win 8.1 is installed on my SSD, I also have a HDD. When I couldn't make room for a new partition on the SSD, I shrank one of the partitions on my HDD and created some room for Win 10 Enterprise preview. I then put the Win 10 iso into a USB thumb drive with the Windows 7 utility mentioned in the HTG guide, and installed to the free space on my HDD.

    Win 10 loads and runs, but all of my drives and partitions are renamed under Win 10. I can run programs off of my SSD, although Visual Studio tells me it is missing a dll and won't run. When I restart, there is no multi boot option from Windows. I downloaded easy BCD and tried to offer one, but the option doesn't work. I can still only boot into 10
      My ComputerSystem Spec

  2.    07 Feb 2015 #2

    I'd like to be able to dual boot, or failing that to boot into windows 8.1 again.

    At the risk of throwing out a red herring, none of my drives are GPT partitioned, all are MBR.
      My ComputerSystem Spec

  3.    07 Feb 2015 #3

    yu gnomi said: View Post
    I'd like to be able to dual boot, or failing that to boot into windows 8.1 again.

    At the risk of throwing out a red herring, none of my drives are GPT partitioned, all are MBR.
    This is what I have used as a work around. Since you can boot to 10 do this. Follow this path to get to your dual boot screen. Settings/ Update and recovery/recovery/advanced startup restart now/ use another os/ continue with another installed version/ choose an os Welcome to TenForums and good luck with your install. Enjoy
      My ComputerSystem Spec

  4.    07 Feb 2015 #4

    The option to boot to Win 8.1 appears, but doesn't work. When I select it, my boot up gets stuck at the splash screen for my bios. I think the option only appears because I put it in via easy BCD.
      My ComputerSystem Spec

  5.    07 Feb 2015 #5

    I have Windows 8.1 installed on an SSD and Windows 10 on an HDD. In the bios I have it set to boot from the SSD so that when I turn on my system I get Windows 8.1. The only way I can get Windows 10 is to reboot an then press F8 during the boot process. That brings up a menu which allows me to select the Windows 10 HHD to boot.

    I don't know if F8 will bring up a boot menu for your bios. Another method I found is to enter the bios setup and it allows me to manually select the boot drive.

    Good luck with it.
      My ComputerSystem Spec

  6.    08 Feb 2015 #6

    yu gnomi. One of these disks is an external?

    Using Easy Bcd, what letter designation did you put for windows 8?
      My ComputerSystem Spec

  7.    08 Feb 2015 #7

    neither is external

    my SSD is C drive in Win 8.1, but in Win 10 it is letter i . So I used i in easy BCD.

    When I choose that option, nothing happens- screen just stays black
      My ComputerSystem Spec

  8.    08 Feb 2015 #8

    You should, I would suggest, use C. in easybcd as the boot designation for windows 8. It will take over that designation on boot up.
      My ComputerSystem Spec

  9.    08 Feb 2015 #9

    added new entry for c drive as win 8.1 and deleted old one. Rebooted, selected that option and the result was a black screen with a band of light green lines across the top- suggested to me that the computer was 'stuck' trying to do something.

    I think I will just re-install, I have already started to backup stuff I can't re-download, or re-install from media I have on hand.
      My ComputerSystem Spec

  10. Posts : 11
    UEFI Windows 8.1 Pro x64
       08 Feb 2015 #10

    I would suggest you to use commandline instead of EasyBCD in this case.
    Note: I will use C: for Windows 10, D: for Windows 8.1 and E: for the boot partition
    Jump to step 2 if your boot partition is already mounted (can be seen in explorer)
    1: Press Win+X and open disk management. Select your boot partition, and assign a drive letter to it.
    2: Press Win+X and open a commandline as administrator. Add a boot option for your Windows 8.1 installation using the tool bcdedit
    For MBR boot this should look like this:
    "bcdboot d:\windows /s e: /f BIOS /d /addlast"
    3: Go to power menu (In Start or the Win+X menu), hold down shift on your keyboard and click on restart. Select the OS you want to use
      My ComputerSystem Spec

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