Windows 8 and 8.1 Forums


Does installer have to boot EFI to install Windows 8 EFI?

  1. #1


    Posts : 3
    OS X Yosemite

    Does installer have to boot EFI to install Windows 8 EFI?


    From the following links my understanding is that in order to install Windows 8 with a GPT partition scheme and EFI booting, the install media has to boot in EFI during installation.

    UEFI Bootable USB Flash Drive - Create in Windows

    How To Make UEFI Bootable USB Flash Drive to Install Windows 8 | Next of Windows

    This seems to be because during installation GPT & EFI vs MBR & BIOS will be selected automatically by the installer based on how the install media itself booted and there's no way to change this automatic choice. Is this correct? Is there a reason it must be this way?

    It seems odd that the Windows 8 installation media itself must boot in EFI in order to install Windows 8 that will boot in EFI. I don't see why it should matter how the install media itself boots.

    If that's the way the installer was designed then that's just the way things are and it doesn't do much good to ask 'why' but I want to make sure my understanding is correct.

      My System SpecsSystem Spec

  2. #2


    Posts : 879
    Windows 10


    Here is info about UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style): link
      My System SpecsSystem Spec

  3. #3


    Posts : 3
    OS X Yosemite


    That is helpful and something I hadn't found but I want to step back from the what to do and get a sense of why it's being done. Creating the UEFI bootable USB is the only way to install Windows 8 that boots through UEFI, right? And this is because the installer detects how the install media booted and installs Windows 8 accordingly?
      My System SpecsSystem Spec

  4. #4


    Posts : 879
    Windows 10


    Quote Originally Posted by khouli View Post
    Creating the UEFI bootable USB is the only way to install Windows 8 that boots through UEFI, right?
    Yes.

    Quote Originally Posted by khouli View Post
    And this is because the installer detects how the install media booted and installs Windows 8 accordingly?
    Yes.
      My System SpecsSystem Spec

  5. #5


    Posts : 2,690
    Windows 3.1 > Windows 10


    It is best to say the windows setup will according to how the PC booted - If it booted via BIOS it will partition MBR partitions. If it booted UEFI it will create GPT partitions,, so what you get depends on how it booted.. But the windows 8 setup will run on both BOIS and UEFI booted PC'S
      My System SpecsSystem Spec

  6. #6


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    Quote Originally Posted by khouli View Post
    That is helpful and something I hadn't found but I want to step back from the what to do and get a sense of why it's being done. Creating the UEFI bootable USB is the only way to install Windows 8 that boots through UEFI, right? And this is because the installer detects how the install media booted and installs Windows 8 accordingly?
    If your are installing from USB thumb drive, for most PC's, it has to be created a certain way. Formatted in FAT32 instead of NTFS etc. As far as I know you don't have to do anything special if you are installing from a DVD. Other than selecting UEFI mode from the boot list. With my ASUS laptop I can format my thumb drive in FAT 32 or NTFS and still install in UEFI mode. My wife's Acer on the other hand is very fussy about how you prepare the thumb drive. And another odd thing with the Acer is UEFI is not listed in the boot menu as an option for the thumb drive, but it still installs in UEFI mode. It had me scratching my head for a while.
      My System SpecsSystem Spec

  7. #7


    Posts : 3
    OS X Yosemite


    Quote Originally Posted by alphanumeric View Post
    As far as I know you don't have to do anything special if you are installing from a DVD. Other than selecting UEFI mode from the boot list.
    That's the behavior I was expecting but I don't recall being prompted for that choice when I installed from DVD. Anyway, I could be mistaken and the USB install method did get the job done.
      My System SpecsSystem Spec

  8. #8


    Sydney, Nova Scotia, Canada
    Posts : 6,490
    Windows 10 Education 64 Bit


    I've never installed Windows 8 from a DVD, I don't think I've even bothered to burn one. I just use thumb drives. The screen shots indicate you'll see your DVD drive listed twice in the boot devices menu. One with UEFI in front of it and one without, like you see for thumb drives. My desktop PC doesn't have UEFI so I'll never see that option on it anyway. I've seen it on my laptop for thumb drives though.
      My System SpecsSystem Spec

Does installer have to boot EFI to install Windows 8 EFI?
Related Threads
For some reason, Windows 8.1. downloader package refuses to see my 8GB SanDisk flash drive as a target for creating bootable Windows 8.1 installer USB media. A 16GB Patriot drive is detected and processed properly, but 8GB SanDisk is ignored. The same is true for the Windows 7 USB/DVD tool. What...
When my friend goes to install any software, he generally sees a message saying it is starting the Windows Installer, then a popup appears (attached) from Windows Installer that offers on option other than OK. Clicking OK just makes the popup go away, the install does not continue. I tried the...
Hi When I turn on my laptop, I get the following message right away: "Your PC needs to be repaired. The boot configuration data file doesn't contain valid information for an operating system. File: \BCD Error code: 0xc0000098
Hi all, I was reading online that Windows 8 will just reinitialize itself if you make any significant hardware changes. Kind of like what it did during the first install/boot. So because of this I had not backed anything up (it's all replaceable I just would really rather not set everything...
Hey all, I just got a new HP ENVY dv7t-7200 CTO Quad that came pre-loaded with Windows 8. I wanted to install Windows 7 so I enabled "Legacy Support" in the BIOS which disabled UEFI mode. Everything went fine from there. I ultimately decided to go back to Windows 8. I found this guide but...
I have tried several suggestions but, so far, without luck. This is an HP Envy, with Windows 7 OEM preinstalled. The Windows 8 installation goes smoothly right up to the last reboot. It goes successfully through the Boot manager, and then black screens with this message: "The Computer Restarted...
Hey all, This is actually an issue my good friend is having. I'm not too tech savvy; I understand the basics of OS installations but if anything goes wrong (as it did in my friend's case), I don't know how to help. Here is the issue: My friend had successfully installed Windows 7 and...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook