Windows 8 and 8.1 Forums


Use legacy boot mode in Windows 8.1

  1. #1


    Posts : 62
    Windows 8.1 Pro, Windows 7 Professional, Windows XP Professional

    Use legacy boot mode in Windows 8.1


    I've been wondering if it's possible to use the legacy (Windows 7 and earlier) BIOS instead of UEFI in Windows 8.1. In my BIOS settings, there is an option to enable the legacy boot mode, but Windows won't boot whenever this is enabled (I get the message 'Operating System not found' instead). Is there any way to enable this?

    NOTE: I am not talking about secure boot; I already have that disabled.

    Thanks in advance.

      My System SpecsSystem Spec

  2. #2


    Posts : 62
    Windows 8.1 Pro, Windows 7 Professional, Windows XP Professional


    Also, I'm using a Dell Inspiron 15 laptop in case that matters.
      My System SpecsSystem Spec

  3. #3


    Posts : 5,360
    7/8/ubuntu/Linux Deepin


    It is a Windows weirdness. It won't boot from a gpt partition unless you use efi.

    If you want to use Bios, windows needs to be on an mbr partitioned disk.
      My System SpecsSystem Spec

  4. #4


    Posts : 5,360
    7/8/ubuntu/Linux Deepin


    GPT>MBR is doable. Various partition mangers will do it.

    You also need a primary partition marked active ( that can be the windows partition , separate one not required).
      My System SpecsSystem Spec

  5. #5


    Posts : 97
    Windows
      My System SpecsSystem Spec

  6. #6


    Marion
    Posts : 111
    Windows 8.1 Pro with Media Center


    Yes, you will have to turn on CSM "Compatibility Support Module" in the bios, however, Windows 8 is optimized to run more efficient in UEFI mode.

    When you try to install Windows 8, did you delete all the partitions, then click new? Windows will create the necessary partitions on the hard drive. The partitions are needed to boot in a UEFI environment.

    Partitions are as followed

    Recovery
    System
    MSR Reserved
    Primary

    Install to the primary drive.

    Plus you need secure boot on with Windows 8 installation.
      My System SpecsSystem Spec

  7. #7


    Posts : 148
    Windows 8.1 Update 1


    If Windows is installed in UEFI mode it definitely won't boot in legacy mode. It's not possible since under UEFI Windows uses a different type of bootloader. That's why it won't boot when legacy mode is enabled. The bios simply does not find the bootloader where it expects it.

    If you want to run Windows in legacy mode you will have to reinstall Windows by booting the setup DVD in legacy mode.

    Converting GPT to MBR partitions is possible though, just search the web for a program that can do it, there are a few out there. But make a backup of your important data before you try to convert your partitions.
      My System SpecsSystem Spec

Use legacy boot mode in Windows 8.1
Related Threads
How to Check if Windows is Booted in UEFI or Legacy BIOS Mode When the PC starts, the firmware interface controls the booting process of the PC, and then passes control to Windows or another operating system. UEFI is a replacement for the older BIOS firmware interface and the Extensible...
Win 8.1 PC - Why Not Leave It In Legacy Mode? I have new Windows 8.1 PC and wanted to enable booting to CD or USB I found a very interesting article that addresses my situation and a solution "Disable UEFI and Enable Legacy Boot" Excerpt
♫ Just bought a Dell Optiplex 7010 Mini-Tower with Win 8 Pro 64-bit, 8 GB RAM, 500 GB hard drive and an Intel i5 3470 processor. Right now, it has Dell BIOS version A16. It is normally in UEFI ON and Secure Boot ON, so that F12 on bootup (one-time boot options) does NOT normally show the...
Hello, I have MSI UEFI Mobo, when I try to boot on my Hard Drive in BIOS, it gives me: "Restart and select proper boot device" but I can boot using UEFI Windows Boot Manager, so I want to add legacy boot besides UEFI Boot. Thanks a lot. Regards, addas
My system is old, I know. MSI Neo2 Nforce3 + HD4650 Radeon AGP + 2 GB mem + AMD Athlon 3000+ However, I wanted to try Windows 8.1 Enterprise Evaluation for it and was able to install it successfully with 32 bit version (64 bit didn't work). I installed Radeon legacy AGP Hotfix 12.6 drivers...
Hello, first post here... First, some context: I have a Dell Inspiron 15R SE that came with Windows 8. I've managed to get a working dual-boot system with Ubuntu 12.10. I can't remember exactly how I done that, but I remember that I had to disable secure boot. I think that the boot...
Hi, I installed W8 on my new system thinking it automatically uses and takes advantage of the UEFI and new partition system, and after a week of use and setting up my new system just the way I like it, I really don't feel like having to go through all that again if not needed. So my question is: Is...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook