Windows 10: can i convert the disk to mbr and install Windows

  1.    31 Aug 2015 #1

    can i convert the disk to mbr and install Windows


    Sorry if this is hijacking a thread but i have a question about this as well. I know i need to disable secure boot in order to change the boot sequence. I ran into an issue trying to install Windows 10 on a GPT partition - it said it couldn't do it. So...after much searching, i learned (??) i need to use diskpart to clean the partitions to create one large unallotted space which would then allow me to install Windows. My question is, can i convert the disk to mbr and install Windows to it that way and run it in that mode. If i can do that, what would be the command to do that? > convert mbr after the clean command?? What about enabling secure boot?? Can i do that if i have installed Windows under MBR rather than GPT???

    Sorry if this has been answered elsewhere but i'm hesitant to clean install Windows 10 without clear instructions. Could some kind soul outline the sequence of commands to do the above. Hopefully, i've been clear enough on what i'm attempting to do. If not, i'll do my best to clarify.

    TIA!
      My ComputerSystem Spec


  2. Posts : 1,037
    Windows 7 Pro x64 Windows 10 Pro x64
       01 Sep 2015 #2

    Yes, you can install to MBR, that`s all I use, you may have to enable Legacy bios or Legacy and UEFI if the bios has that option, my Z87 does.

    Disable secure boot before any install.

    You can google the commands or find them easily in the tut section here or at Seven Forums, but convert MBR sounds right, I don`t remember off the top of my head, had it written down somewhere.

    Convert GPT Disk to MBR Disk - Windows 7 Help Forums

    It`s very simple to do.
      My ComputerSystem Spec

  3.    02 Sep 2015 #3

    Thank you for the replies - you both have put my mind at ease if and when i deside to clean install Windows 10 on my laptop.
      My ComputerSystem Spec


  4. Posts : 2,033
    Ubuntu14.04x64 MintMate17x64 Win10Prox64
       02 Sep 2015 #4

    It 's better to let Windows do all that work for you ie. create the needed partitions whether you want to install using GPT or MBR. Here's the steps.
    1. Make sure to disconnect all HD's/SSD's except the one you plan to install Windows.
    2. In BIOS: disable Secure Boot. Set to UEFI if you want to install Windows in UEFI Mode otherwise set it to the legacy BIOS.
    3. Boot the installation USB/DVD. Select the boot mode as shown in screen shot. It's important that you select the correct one so Windows will initialize the disk appropriately (GPT/MBR)
      Click image for larger version. 

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    4. On the first screen, press and hold SHIFT key + F10. Command Windows pops up
    5. diskpart
    6. select disk 0
    7. clean
    8. exit
    9. exit
    10. Continue with the installation, click on Custom Installation and select the unallocated partition (disk 0). Do not format, click next and let Windows creates the needed partitions
    Last edited by topgundcp; 06 Sep 2015 at 21:21.
      My ComputerSystem Spec

  5.    02 Sep 2015 #5

    topgundcp said: View Post
    ...Continue with the installation, click on Custom Installation and select the unallocated partition (disk 0). Do not format, click next and let Windows creates the needed partitions
    Thank you 'topgundcp' for the detailed instructions, much appreciated!!

    Regarding the above, if i want to set up as mbr, can i not format the drive to prevent the install of the 450 mb reserved partition?? Also, if i set up as mbr 1) do i need to add command > convert mbr to the above diskpart commands and 2) do i need to reenable secure boot in the BIOS? If i do, will i have a problem booting to Windows? Is it best just to leave as Legacy in BIOS?

    Thanks for the help
      My ComputerSystem Spec

  6.    03 Sep 2015 #6

    I might be wrong but I think Windows will insist on the reserved partition. It uses it for house keeping.
      My ComputerSystem Spec

  7.    03 Sep 2015 #7

    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
    Last edited by genet; 03 Oct 2015 at 09:32.
      My ComputerSystem Spec

  8.    04 Sep 2015 #8

    Thank you 'genet' for the detailed instructions - very much appreciated!
      My ComputerSystem Spec

  9.    06 Sep 2015 #9

    I'm still not 100% clear on this one: can I install Windows 10 in UEFI boot mode if I am installing from a Microsoft Windows 10 Pro DVD?

    If I pop the DVD into the drive and boot my PC to the boot selection page (F6 on my Asus Motherboard), I do not get an option for my DVD drive to run in UEFI mode. Just normal mode. I only get such an option if I have a USB ISO plugged in.
      My ComputerSystem Spec


 

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