1.    01 Mar 2017 #1
    Join Date : Oct 2014
    Posts : 273
    Windows 10 Build 1703

    Converting Windows 10 MBR Disk to GPT

    I have two internal disks and one external on my desktop. One of the internals is a GPT 1Tb disk for data and archive storage. The other is an MBR Windows 10 system disk and the external one is a 1TB USB. The system disk contains a System Reserved partition and the Windows 10 partition.

    Would there be any advantage to converting the MBR disk to a GPT if it could be done?

    Thank you.
      My ComputerSystem Spec
  2.    01 Mar 2017 #2
    Join Date : Jun 2016
    Los Angeles
    Posts : 1,050
    Windows 10 Pro

    The main reason to convert an MBR disk to GPT is either because you have a UEFI Bios boot computer or the HDD is larger then 2.2TB. Any Drive larger then 2TB must be Initialized GPT to recognize the whole drive in one partition. Or you can create two MBR partitions. If a GPT drive is the boot drive, it will only work in a UEFI Bios, you cannot boot a Windows OS on a GPT drive unless it is UEFI Bios.
    To convert an MBR disk to GPT you must re-Initialize it. This will wipe all data off of the drive.
    Since your OS drive is 1TB and your Bios is probably not UEFI, there is no advantage to converting to GPT and in fact you would have to reinstall your Windows OS, which also won't work unless your Bios is UEFI.
      My ComputerSystem Spec
  3.    01 Mar 2017 #3
    Join Date : Aug 2014
    Forever West
    Posts : 3,927
    Win10 Home and Pro, Win10 Insider Preview, Win7 Home, Linux Mint

    The other is an MBR Windows 10 system disk
    How big is that system disk? Most times it will be either a smaller partition like mine at 150GB [C:] on a 1TB HDD with the rest being the Data [D:] partition. Or it may be a separate smaller SSD of maybe 128GB or 256GB with a second physical drive of 1TB.
      My ComputerSystem Spec
  4.    01 Mar 2017 #4
    Join Date : Jul 2015
    Posts : 9,419
    Windows 10 Pro

    If you have a UEFI bios and you want to convert the boot drive to UEFI, you can make an image backup of your OS partition to another drive. Wipe the hard drive, convert it to GPT, do a clean install of Windows 10 to it as a GPT format drive. Then replace the newly created OS partition with your previously saved OS partition.

    Even if your computer is UEFI - the only real advantage to GPT on a 1 TB hard drive is the ability to create more than 4 partitions if you want to without having to have an extended partition and logical drives.
      My ComputerSystem Spec
  5.    01 Mar 2017 #5
    Join Date : Jan 2016
    Posts : 24
    Windows 10

    The Macrium procedure to convert an MBR to a GPT disk:
    Restoring an MBR System image to UEFI/GPT - KnowledgeBase - Macrium Reflect Knowledgebase
    This is a destructive process (original info is lost).

    Another procedure:
    This procedure is non-destructive.

    Neither of these processes create the GPT Recovery (WinRE) partition, and in both cases the WinRE may not work after the conversion.
      My ComputerSystem Spec
  6.    01 Mar 2017 #6
    Join Date : Oct 2014
    Posts : 273
    Windows 10 Build 1703
    Thread Starter

    Thank you very much everyone. Clearly, I will just leave everything as it is.
      My ComputerSystem Spec
  7.    01 Mar 2017 #7
    Join Date : May 2016
    FL, USA
    Posts : 148
    Windows 10-Pro 64bit

    The Macrium Reflect procedure worked for me on 2 different machines. Some partitioning tools now support the conversion natively. Not sure if any of their free ones do, yet.
    Convert System Disk from MBR to GPT within 3 Steps – EaseUS
      My ComputerSystem Spec
  8.    02 Mar 2017 #8
    Join Date : Jan 2016
    Posts : 24
    Windows 10

    The procedures supported by partition tools usually apply only to data (non boot) disks.

    MiniTool Partition Wizard claims to support the procedure for boot disks in the paid version of v. 10.x, but I checked and the procedure failed, reports that the MBR disk doesn´t contain the necessary EFI files (obvioulsy it doesn´t, it´s an MBR disk).
      My ComputerSystem Spec


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