Windows 8 and 8.1 Forums


2nd Windows 8.1 cannot be installed

  1. #1


    Norway
    Posts : 100
    Windows 8.1 Pro x64

    2nd Windows 8.1 cannot be installed


    Hey guys, i got a little problem here. So i wanted to install a 2nd Windows 8.1 OS on a new partition of my SSD wich i made, and it has 40GB to use for it wich is more than enough (all programs and games are on the 3TB HDD). Anyways, all drives on my system are in GPT, wich i had to format them to when i first installed Windows 8.1 because of my new Motherboard. But now the problem is, that when i put in the Windows 8.1 DVD in to install a 2nd version of it, and i click in the installation menu the partition i prepared for it, it says "Windows cannot be installed to this disk. The disk is of the GPT format". So how do i solve this? First it moaned about it not being GPT, now it is and it still is just moaning about it. What can i do to fix this? I want a 2nd Windows 8.1 because of things like Shadowplay and such not working correct, and instead of reinstalling Windows 8.1 again (i think all the problems with that come from all the modifications i do to the Audio Driver and using the Beta Oculus Rift driver), i just install a 2nd copy wich is much easier to fix such stuff, like it will be my dedicated Gaming OS. So again, what is wrong here? Thanks in advance

      My System SpecsSystem Spec

  2. #2


    Posts : 879
    Windows 10


    Quote Originally Posted by Yanniclord View Post
    it says "Windows cannot be installed to this disk. The disk is of the GPT format". So how do i solve this?
    Boot from the Windows installation media in UEFI Boot Mode, so you can use GPT (GUID Partition Table).

    Quote from this post: UEFI Boot Mode (installing using the GPT partition style) and Legacy BIOS Boot Mode (installing using the MBR partition style). -> link

    Tip   Tip
    Error message when you boot from the Windows installation media in Legacy BIOS Boot Mode:

    Windows cannot be installed to this disk. The selected disk is of the GPT partition style. (see screenshot below)

    That is because Windows can only be installed to MBR disk in Legacy BIOS Boot Mode, but you plan to install Windows on a GPT disk.

    - Boot from the Windows installation media in UEFI Boot Mode, so you can use GPT (GUID Partition Table).
    - But if you want to use MBR (Master Boot Record) partition table, then delete all partitions on the disk.

    Click image for larger version

    Error message when you boot from the Windows installation media in UEFI Boot Mode:

    Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks. (see screenshot below)

    That is because Windows can only be installed to GPT disk in UEFI Boot Mode, but you plan to install Windows on an MBR disk.

    - Delete all partitions on the disk, so you can use GPT (GUID Partition Table).
    - But if you want to use MBR (Master Boot Record) partition table, then boot from the Windows installation media in Legacy BIOS Boot Mode.

    Click image for larger version
    Last edited by genet; 13 Nov 2015 at 13:34.
      My System SpecsSystem Spec

  3. #3


    Norway
    Posts : 100
    Windows 8.1 Pro x64


    Quote Originally Posted by genet View Post
    Quote Originally Posted by Yanniclord View Post
    it says "Windows cannot be installed to this disk. The disk is of the GPT format". So how do i solve this?
    Boot in UEFI Boot Mode, so you can use GPT (GUID Partition Table).

    Quote from this post:

    Error message when you boot in Legacy BIOS Boot Mode: Windows cannot be installed to this disk. The selected disk is of the GPT partition style. (see screenshot below)

    - Boot in UEFI Boot Mode, so you can use GPT (GUID Partition Table).
    - But if you want to use MBR (Master Boot Record) partition table, then delete all partitions on the disk.



    Error message when you boot in UEFI Boot Mode: Windows cannot be installed to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks. (see screenshot below)

    - Delete all partitions on the disk, so you can use GPT (GUID Partition Table).
    - But if you want to use MBR (Master Boot Record) partition table, then boot in Legacy BIOS Boot Mode.

    How do you select UEFI Boot Mode or Legacy BIOS Boot Mode.

    Note: The UEFI firmware settings determines what type of boot devices are available in the boot menu: UEFI, Legacy BIOS (aka CSM), or both types of boot devices.

    Note: You do not need to change the boot order of drives in your UEFI firmware settings.
    - Connect your Windows 7/8 USB flash drive or insert your Windows 7/8 DVD.
    - Restart the computer.
    - Press the correct key to enter the boot menu (Esc, F8, F9, F10, F11, F12).
    - Select your USB/DVD from the boot menu.

    EXAMPLE: Windows 8 64-bit USB flash drive in the Asus motherboard boot menu (see screenshot below).

    You may notice a bootable USB flash drive showing twice in the boot menu, one marked UEFI and one not marked UEFI.

    Ye i do not have that UEFI option on my DVD drive when i boot it, else i woudnt ask because i know the solution to this if it was like this. I have an ASRock Extreme4 Z97 Motherboard. Any option i have to enable/disable?
      My System SpecsSystem Spec

  4. #4


    Posts : 879
    Windows 10


    Quote Originally Posted by Yanniclord View Post
    I have an ASRock Extreme4 Z97 Motherboard. Any option i have to enable/disable?
    CSM (Compatibility Support Module)

    Enable to launch the Compatibility Support Module. Please do not disable unless youíre running a WHCK test. If you are using Windows 8.1/8 64-bit and all of your devices support UEFI, you may also disable CSM for faster boot speed.

    Click image for larger version

    -or-

    Secure Boot

    Use this item to enable or disable support for Windows 8 Secure Boot.

    Click image for larger version

    -or-

    Quote from this post:

    1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.

    Format your USB flash drive (see screenshot below). Note: You need to choose the FAT32 file system.

    When formatting is complete.
    - In Windows 8, mount the Windows 8 64-bit ISO image file by right-clicking the ISO image file and choosing Mount. If you donít see Mount command from the context menu, go to Open with -> Windows Explorer instead.
    - Select everything in the mounted ISO image file, and copy them into the USB flash drive you prepared earlier.

      My System SpecsSystem Spec

  5. #5


    Norway
    Posts : 100
    Windows 8.1 Pro x64


    Quote Originally Posted by genet View Post
    Quote Originally Posted by Yanniclord View Post
    I have an ASRock Extreme4 Z97 Motherboard. Any option i have to enable/disable?
    CSM (Compatibility Support Module)

    Enable to launch the Compatibility Support Module. Please do not disable unless you’re running a WHCK test. If you are using Windows 8.1/8 64-bit and all of your devices support UEFI, you may also disable CSM for faster boot speed.

    Click image for larger version

    -or-

    Secure Boot

    Use this item to enable or disable support for Windows 8 Secure Boot.

    Click image for larger version

    -or-

    Quote from this post:

    1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.

    Format your USB flash drive (see screenshot below). Note: You need to choose the FAT32 file system.

    When formatting is complete.
    - In Windows 8, mount the Windows 8 64-bit ISO image file by right-clicking the ISO image file and choosing Mount. If you don’t see Mount command from the context menu, go to Open with -> Windows Explorer instead.
    - Select everything in the mounted ISO image file, and copy them into the USB flash drive you prepared earlier.

    Ok problem. I just checked the BIOS and the setting ARE already on what you said they should be. CSM is enabled, all are set to Legacy Only and Secure Boot is off. Do i have to set the Legacy Only to UEFI only in the CSM? And if so, wich one?
      My System SpecsSystem Spec

  6. #6


    Posts : 879
    Windows 10


    Quote Originally Posted by Yanniclord View Post
    Ok problem. I just checked the BIOS and the setting ARE already on what you said they should be. CSM is enabled, all are set to Legacy Only and Secure Boot is off. Do i have to set the Legacy Only to UEFI only in the CSM? And if so, wich one?
    "Enable to launch the Compatibility Support Module. Please do not disable unless youíre running a WHCK test. If you are using Windows 8.1/8 64-bit and all of your devices support UEFI, you may also disable CSM for faster boot speed."
      My System SpecsSystem Spec

  7. #7


    Norway
    Posts : 100
    Windows 8.1 Pro x64


    Quote Originally Posted by genet View Post
    Quote Originally Posted by Yanniclord View Post
    Ok problem. I just checked the BIOS and the setting ARE already on what you said they should be. CSM is enabled, all are set to Legacy Only and Secure Boot is off. Do i have to set the Legacy Only to UEFI only in the CSM? And if so, wich one?
    "Enable to launch the Compatibility Support Module. Please do not disable unless youíre running a WHCK test. If you are using Windows 8.1/8 64-bit and all of your devices support UEFI, you may also disable CSM for faster boot speed."
    Oh ok so disable CSM, sorry :P

    EDIT: Did NOT fix it, as i disabled CSM EVERYTHING disappeared. I could still boot windows with the "Windows Boot Manager" but there was NO DVD drive or anything there. What now?
      My System SpecsSystem Spec

  8. #8


    Norway
    Posts : 100
    Windows 8.1 Pro x64


    Quote Originally Posted by Yanniclord View Post
    Quote Originally Posted by genet View Post
    Quote Originally Posted by Yanniclord View Post
    Ok problem. I just checked the BIOS and the setting ARE already on what you said they should be. CSM is enabled, all are set to Legacy Only and Secure Boot is off. Do i have to set the Legacy Only to UEFI only in the CSM? And if so, wich one?
    "Enable to launch the Compatibility Support Module. Please do not disable unless you’re running a WHCK test. If you are using Windows 8.1/8 64-bit and all of your devices support UEFI, you may also disable CSM for faster boot speed."
    Oh ok so disable CSM, sorry :P

    EDIT: Did NOT fix it, as i disabled CSM EVERYTHING disappeared. I could still boot windows with the "Windows Boot Manager" but there was NO DVD drive or anything there. What now?
    Also btw my SATA mode is set on AHCI, because that is what comes up infront of EVERY drive, like DVD ROM or the SSD, in the Boot Menu where i can pick between those, there is AHCI infront of all of them.
      My System SpecsSystem Spec

  9. #9


    Posts : 879
    Windows 10


    Quote Originally Posted by Yanniclord View Post
    EDIT: Did NOT fix it, as i disabled CSM EVERYTHING disappeared. I could still boot windows with the "Windows Boot Manager" but there was NO DVD drive or anything there. What now?
    Quote from this post:

    1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.

    Format your USB flash drive (see screenshot below). Note: You need to choose the FAT32 file system.

    When formatting is complete.
    - In Windows 8, mount the Windows 8 64-bit ISO image file by right-clicking the ISO image file and choosing Mount. If you donít see Mount command from the context menu, go to Open with -> Windows Explorer instead.
    - Select everything in the mounted ISO image file, and copy them into the USB flash drive you prepared earlier.

      My System SpecsSystem Spec

  10. #10


    Norway
    Posts : 100
    Windows 8.1 Pro x64


    Quote Originally Posted by genet View Post
    Quote Originally Posted by Yanniclord View Post
    EDIT: Did NOT fix it, as i disabled CSM EVERYTHING disappeared. I could still boot windows with the "Windows Boot Manager" but there was NO DVD drive or anything there. What now?
    Quote from this post:

    1. How to create UEFI Boot Mode compatible Windows 8 64-bit USB flash drive, which is only bootable in UEFI Boot Mode.

    Format your USB flash drive (see screenshot below). Note: You need to choose the FAT32 file system.

    When formatting is complete.
    - In Windows 8, mount the Windows 8 64-bit ISO image file by right-clicking the ISO image file and choosing Mount. If you donít see Mount command from the context menu, go to Open with -> Windows Explorer instead.
    - Select everything in the mounted ISO image file, and copy them into the USB flash drive you prepared earlier.

    Point of using DVD is because i do not have a USB at that size for the moment. And you are repeating yourself btw. The thing is that i disabled CSM, didnt fix it. I got AHCI configured. Secure Boot is also disabled. Still no way to get it to work. I also dont have a USB drive to use right now. So?

    EDIT: I might have narrowed it down to be because of ASMedia SATA Controllers, i will try to disable them because there is a A0 on the SATA ports and not a normal 0 or 1, and people have reported issues with them. But if you still mind helping that would be nice.

    EDIT 2: Did not fix it either, im out of ideas. I do not have a USB at that size, and its not my fault the Motherboard wont accept the UEFI DVD. As i said, controllers are on AHCI, CSM was disabled wich did not work either, so i dont know what do do anymore.
    Last edited by Yanniclord; 28 Jun 2015 at 15:42.
      My System SpecsSystem Spec

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