Windows 8 and 8.1 Forums


BIOS Boot Order has been completely ignored

  1. #1


    Posts : 5
    Windows 8.1 64-bit

    BIOS Boot Order has been completely ignored


    Hi everyone,

    Before I start, please tell me if this is in the wrong category. Virtualization seemed like the most applicable

    Anyway,

    I am on a laptop running Windows 8.1 x64. I have an external Hard Drive, with 3 partitions. ONE of them, assigned as X:, contains Windows 7 Ultimate x64. Using the Advanced System Settings built into Windows 8.1, I tried using the 'Use a device' option, and it came up with three options under the name of my hard drive. I assume these were the three partitions, but hey all had the same name. I cannot tell the difference between them. I tried selecting all of them to boot, and the computer still booted to Windows 8.1. I tried editing the boot order in the bios, trying the three partitions as the first option, and it still didn't boot to my copy of Windows 7.

    Is there something that I'm doing wrong, or does Windows 8.1 simply not allow external USB booting?

      My System SpecsSystem Spec

  2. #2


    Posts : 2,130
    Windows 8.0 x64


    If the external HD is MBR then I think you have to turn off EUFI. Also secure booting. Afaik if EUFI is enabled then only GPT Windows partitions can boot(or OS that can handle EUFI such as some Linux distros.)

    Secure Boot - Enable or Disable in UEFI
    I believe in the EUFI options you must have Legacy or Legacy + EUFI selected or MBR type drives just will not boot.
    For my backup image software I had to set up a USB to boot using EUFI(well, Macrium did it for me.) In that case all I have to do is select the USB in the boot order.

    Edit: I think this issue would come under Installation and Setup. Virtualization is about running virtual machines or guest OS etc..
    Last edited by MilesAhead; 22 May 2014 at 08:14.
      My System SpecsSystem Spec

  3. #3


    Hafnarfjörður IS
    Posts : 4,376
    Linux Centos 7, W8.1, W7, W2K3 Server W10


    Quote Originally Posted by MilesAhead View Post
    If the external HD is MBR then I think you have to turn off EUFI. Also secure booting. Afaik if EUFI is enabled then only GPT Windows partitions can boot(or OS that can handle EUFI such as some Linux distros.)

    Secure Boot - Enable or Disable in UEFI
    I believe in the EUFI options you must have Legacy or Legacy + EUFI selected or MBR type drives just will not boot.
    For my backup image software I had to set up a USB to boot using EUFI(well, Macrium did it for me.) In that case all I have to do is select the USB in the boot order.

    Edit: I think this issue would come under Installation and Setup. Virtualization is about running virtual machines or guest OS etc..
    Hi there.

    OH dear there's a lot of MIS info about UEFI.

    UEFI in NO form or shape requires that a UEFI OS is used for boot -- you should - especially on a laptop get a choice in the boot up menu -- usually by pressing the ESC key or similar --you often don't need to get into the full BIOS.

    What though is MANDATORY is to DISABLE PROTECTED (or SECURE) BOOT (and if there is also a checkbox for enabling legacy boot check that too).

    UEFI IS NOT SECURE BOOT (although you will need a UEFI system in order to USE secure boot).

    Nothing in the UEFI spec stops a normal MBR disc from booting. Many Linux live CD's for example boot totally from an external USB stick - and these can be either UEFI, standard or Hybrid where you'll see in the boot menu TWO choices for the same device one marked / labelled UEFI and the other not.

    Cheers
    jimbo
      My System SpecsSystem Spec

  4. #4


    Orbiting the Moon
    Posts : 2,975
    Windows 10 x64


    Hello,

    Performance & Maintenance or General Support seem to also be good sections for this. Although you could encounter the same thing using virtualization, so IMHO it's good to go here.

    To the point,
    I believe the USB isn't allowed to boot by the secure boot option. Your BIOS most probably has a 'legacy mode' that is disabled by default.
    Enable 'legacy mode' which will usually disable secure boot and then try to reboot again and use a boot to the 'device selection screen' (each manufacturer has its own shortcut ket to this, F2 - F12 , etc...).

    We are not talking about UEFI: with UEFI standard enabled you can boot legacy/MBR USBs and disks besides UEFI/GPT USBs and disks.

    Good luck
      My System SpecsSystem Spec

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