Windows 8 and 8.1 Forums


Windows 8 can't start due to missing EFI partition

  1. #11


    Posts : 879
    Windows 10


    Quote Originally Posted by naujoks View Post
    In my frustration I tried to re-install Windows on the same partition where the old installation is, but that isn't working either: "The selected disk is of the GPT partition style. Windows cannot be installed to this hard disk space. The partition is an EFI system partition (ESP)."
    Error message when you boot in Legacy BIOS Boot Mode:

    Click image for larger version

    You need to select to boot from the UEFI type (marked UEFI in the boot menu) if you want to install Windows 8 64-bit in UEFI boot mode.

    Here is info about Legacy BIOS Boot Mode (installing using the MBR partition style) and UEFI Boot Mode (installing using the GPT partition style): LINK

    edit:

    Error message when you boot in UEFI Boot Mode:

    Click image for larger version
    Last edited by genet; 25 Aug 2014 at 12:34.

      My System SpecsSystem Spec

  2. #12


    Posts : 8
    Win 8


    Quote Originally Posted by genet View Post
    Quote Originally Posted by naujoks View Post
    In my frustration I tried to re-install Windows on the same partition where the old installation is, but that isn't working either: "The selected disk is of the GPT partition style. Windows cannot be installed to this hard disk space. The partition is an EFI system partition (ESP)."
    Error message when you boot in Legacy BIOS Boot Mode:

    Click image for larger version

    You need to select to boot from the UEFI type (marked UEFI in the boot menu) if you want to install Windows 8 64-bit in UEFI boot mode.

    Here is info about Legacy BIOS Boot Mode (installing using the MBR partition style) and UEFI Boot Mode (installing using the GPT partition style): LINK
    I am trying and want to install in UEFI Boot Mode and have selected my install DVD accordingly. That's not it either.
      My System SpecsSystem Spec

  3. #13


    Posts : 879
    Windows 10


    Quote from this post:

    Normally, you should be able to delete all the partitions on the Where do you want to install Windows? screen.

    Note: But if you cannot delete all the partitions on the Where do you want to install Windows? screen.

    - Boot the computer using the Windows 7/8/10 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    diskpart
    list disk (this will give you a listing of the disks on your system)
    select disk # (select the disk you want to clean, for example select disk 0)
    clean (running the clean command will delete all partitions on the disk)
    exit

    Even if you are going to use the GPT (GUID Partition Table), you do not need to run the convert gpt command, since you are not creating the partitions at a command prompt.

    - Close the command prompt window and continue your Windows installation as usual.

    Click image for larger version
    Last edited by genet; 07 Nov 2015 at 11:20.
      My System SpecsSystem Spec

  4. #14


    Posts : 8
    Win 8


    I ended up having to use the command prompt on the Windows install disk to copy things manually from my C: drive to an external HDD. Very boring and laborious.
    I then finally managed to install Windows after formatting the whole drive. It was the last thing I wanted to do, but at least now all the relevant partitions are on that drive, so that's good.
    Still find it hard to believe that despite the drive containing a working Windows partition I was unable to get it to boot. This definitely would not have happened under Windows 7!
    Thanks for all your help though!
      My System SpecsSystem Spec

  5. #15


    Harrisonburg, Va.
    Posts : 10,488
    Windows 8.1.1 Pro with Media Center


    Does anyone know what I could try, or at the very least how I can get my data off that drive and re-install Windows?
    Losing stuff is hard.
    Save what you can to usb.

    I suggest restoring to factory specs & starting from scratch.

    Then getting Macrium Reflect to image all your local drives on usb. {32 or 64 GB size should do with maximum compression.}

    Macrium has been a god-send to me.
      My System SpecsSystem Spec

  6. #16


    Posts : 1
    Windows 8
      My System SpecsSystem Spec

  7. #17


    Posts : 1
    Windows 10


    Kudos to you. My EFI partition for windows 10 was on a different drive than the OS. When I flashed a Linux OS on the drive with the EFI partition, the boot command for Windows was erased. Option 3 fixed my problem. Thanks!
      My System SpecsSystem Spec

  8. #18


    Quote Originally Posted by genet View Post
    If you have deleted the System Reserved partition, not the EFI System partition, then take a look at this post. -> link

    How to create the missing EFI System partition.

    The EFI System partition is required to boot the computer, when you are using the GPT partition style. The UEFI firmware scan your computer's hard disks for existence of the EFI System partition, then run \efi\boot\bootx64.efi file in the EFI System partition. This partion has to be formatted with FAT32 file system.

    - For Advanced Format Generation One (4-KB-per-sector) drives, the minimum size of this partition is 260 MB.
    - For earlier 512-byte-per-sector drives, the minimum size of this partition is 100 MB.

    Attachment 63079

    CONTENTS:

    - Option One: How to create the missing EFI System partition, if you still have the unallocated space available for the EFI System partition and no other unallocated space on the drive.
    - Option Two: How to create the missing EFI System partition, if you have the unallocated space available for the EFI System partition.
    - Option Three: How to create the missing EFI System partition, if you do NOT have the unallocated space available for the EFI System partition.

    > OPTION ONE <

    How to create the missing EFI System partition, if you still have the unallocated space available for the EFI System partition and no other unallocated space on the drive.

    - Boot the computer using the Windows 7/8/8.1 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    diskpart
    list disk
    select disk # Note: Select the disk where you deleted the EFI System partition.
    list partition
    create partition efi
    format quick fs=fat32
    list partition
    list volume Note: Note the volume letter where the Windows OS is installed.
    exit

    bcdboot X:\windows Note: Replace "X" with the volume letter of the Windows OS partition.

    BCDBoot copies the boot files from the Windows partition to the EFI System partition and creates the BCD store in the same partition.

    - Remove the Windows installation media and restart the computer.

    Attachment 63090

    Attachment 63091

    > OPTION TWO <

    How to create the missing EFI System partition, if you have the unallocated space available for the EFI System partition.

    - Boot the computer using the Windows 7/8/8.1 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    diskpart
    list disk
    select disk # Note: Select the disk where you want to add the EFI System partition.
    list partition
    create partition efi size=260
    format quick fs=fat32
    list partition
    list volume Note: Note the volume letter where the Windows OS is installed.
    exit

    bcdboot X:\windows Note: Replace "X" with the volume letter of the Windows OS partition.

    BCDBoot copies the boot files from the Windows partition to the EFI System partition and creates the BCD store in the same partition.

    - Remove the Windows installation media and restart the computer.

    Attachment 63086

    Attachment 63087

    > OPTION THREE <

    How to create the missing EFI System partition, if you do NOT have the unallocated space available for the EFI System partition.

    - Boot the computer using the Windows 7/8/8.1 installation media.
    - On the first screen, press SHIFT+F10 to bring up the command prompt.
    - Run the following commands at the command prompt.

    diskpart
    list disk
    select disk # Note: Select the disk where you want to add the EFI System partition.
    list partition
    select partition # Note: Select the Windows OS partition or your data partition.
    shrink desired=260
    create partition efi size=260
    format quick fs=fat32
    list partition
    list volume Note: Note the volume letter where the Windows OS is installed.
    exit

    bcdboot X:\windows Note: Replace "X" with the volume letter of the Windows OS partition.

    BCDBoot copies the boot files from the Windows partition to the EFI System partition and creates the BCD store in the same partition.

    - Remove the Windows installation media and restart the computer.

    Attachment 63093

    Attachment 63094

    Other instructions.

    - 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
    - How to download and clean install Windows 8.1 if you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8/8.1 product key. -> link

    How to delete the EFI System partition.

    - Windows 7/8/8.1 does not start, if you delete the EFI System partition.
    - If you want to delete the EFI System partition, you must use the delete partition override command.

    - Boot the computer using the Windows 7/8/8.1 installation media.
    - On the first screen, press SHIFT+F10 to bring up command prompt.

    diskpart
    list disk
    select disk #
    list partition
    select partition # Note: Make sure to select the EFI System partition.
    delete partition override

    Amazing!!!, 3 years later this post save my life and work, ****! thank you very much for that instructions !!!!
      My System SpecsSystem Spec

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