Windows 8 and 8.1 Forums


Convert disk From MBR to GPT to install windows

  1. #1


    Posts : 11
    Windows 8 64 bit

    Convert disk From MBR to GPT to install windows


    I attempted to install windows from a USB, but it gave an error saying "Error: 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."

    I disabled all EFI boot sources and safe boot, but the error is still appearing.

    I would like to know how to convert my drive from a MBR to a GPT without having to delete the partitions already on the drive, without suffering any data loss, and without purchasing software (like that from AOMEI) to do so.

    If you know how to solve this problem, your help would really really be appreciated! thank you!

      My System SpecsSystem Spec

  2. #2


    Posts : 5,592
    ME, XP,Vista,Win7,Win8,Win8.1


    To clean install:
    1) Clean the HD Drive, using Step one in this tutorial:
    SSD / HDD : Optimize for Windows Reinstallation - Windows 7 Help Forums
    than
    2a) Clean install with the OEM manufacturer's Recovery Disk.

    2b) Clean Install - Windows 8


    2c) UEFI (Unified Extensible Firmware Interface) - Install Windows 8 with

    For USB:

    x64
    UEFI Bootable USB Flash Drive - Create in Windows
      My System SpecsSystem Spec

  3. #3


    Posts : 1,875
    Windows 10 Pro Prieview x64


    If you want you can use GPT fdisk Tutorial

    You have to be careful though to type in the correct numbers (for where partitions start). It did work for me.
      My System SpecsSystem Spec

  4. #4


    Posts : 879
    Windows 10


    Quote Originally Posted by nster View Post
    I attempted to install windows from a USB, but it gave an error saying "Error: 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."
    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 13:22.
      My System SpecsSystem Spec

Convert disk From MBR to GPT to install windows
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