How to Convert MBR to GPT and GPT to MBR [Step


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When it comes to hard drives and partitions, MBR stands for Master Boot Record. GPT on the other hand is a GUID partition table which contains information about where your system’s operating systems can be found in relation to each other. If you ever have trouble with converting between these two file formats then this article should help you out.

The “how to convert mbr to gpt during windows installation” is a step by step guide on how to convert the Master Boot Record (MBR) to GUID Partition Table (GPT) and the GPT to MBR.

How to Convert MBR to GPT and GPT to MBR [Step

Have you just acquired a new hard drive but are unable to access the whole disk space? Is there a limit of 2TB? Perhaps you have a complicated operating system setup and need more than four active partitions on your hard drive? Your disk will very certainly need to be converted from MBR to GPT.

In this tutorial, you will learn the difference between MBR & GPT partition table schemes and how to convert MBR to GPT. You’ll also learn how to take the next step to actually get Windows to recognize that GPT disk by switching your BIOS to UEFI.


  • A computer running Windows 10. This lesson will be performed on Windows 10 version 20H2.
  • A storage volume with MBR formatting.
  • An account in the group of local administrators – Some of the tasks you’ll do will need privilege elevation.

What Is the Definition of a Partition Table Scheme?

At the firmware level of your hard disk, a partition table is a low-level structure. Before a disk can be formatted and made ready for data, the hard drives must first be introduced to an operating system.

Every hard drive comes with at least one partition table scheme called Master Boot Record (MBR), however there is now a new partition table scheme called GPT (GUID Partition Table) that has updated and unique characteristics.

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How Do You Know If Your Drive Is MBR or GPT?

You must first determine the partition table scheme you are using before making any modifications to your hard disk. So let’s get this lesson started by looking at how to figure out which kind is already in use.

1. Launch the Disk Management application. You should see a list of all partitions that Windows presently recognizes.

2. To open the volume window, right-click on Disk 0 and choose Properties.

If you have numerous hard disks connected, they will all appear as Disk 0, Disk 1, Disk 2, and so on.

To see the disk properties, open Disk Management.To see the disk properties, open Disk Management.

3. Select the Volume option. The Partition style is seen here. The Master Boot Record (MBR) partition style shows the partition table structure in the tutorial’s sample volume below.

In the disk properties panel, look at the Partition Style.In the disk properties panel, look at the Partition Style.

Only two partition styles are available: GUID Partition Table (GPT) and Master Boot Record (MBR).

Using the GUI to convert MBR to GPT

Let’s look at how to change an MBR partition scheme to GPT using the Disk Management GUI now that you know the partition table scheme you have.

Converting MBR to GPT is simple using the Disk Management GUI. Convert to GPT Disk by right-clicking on the disk you want to convert.

You can only convert a disk from MBR to GPT if it contains no data or is encrypted with BitLocker and Bitlocker is enabled. You’ll learn how to get around this constraint later in the command-line portions.

Disk Management > Convert to GPT Disk” />Disk Management > Convert to GPT Disk</p>
<h2>Diskpart to convert MBR to GPT</h2>
<p>The command line is your buddy if the GUI isn’t your thing or if you want to do an MBR to GPT conversion in a script. Let’s start with the command line how-tos by looking at how to use the Diskpart utility to conduct the conversion.</p>
<p>1. Log in as an administrator to a command prompt.</p>
<p>2. Type diskpart to open the command-line utility. You’ll be moved into the interactive Diskpart menu. You’ll notice this because the prompt changes to DISKPART>.</p>
<p><img decoding=Start diskpart from the command prompt.

3. Type list disk to see all the disks connected to the computer. Take note of the asterisk in the Gpt output column. This asterisk indicates that the disk has previously been formatted in GPT.

diskpart - list disk commandlist disk command – diskpart

4. Type pick disk 1 to notify diskpart that you want to do anything with a disk.

diskpart - select disk commanddiskpart – command to choose a disk

5. Now type convert gpt to change the MBR partition table scheme to GPT. You should get a successful message if everything works smoothly.

diskpart - convert to gptconvert to gpt using diskpart

6. To securely quit the diskpart utility, type exit.

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Using MBR2GPT to convert MBR to GPT

The MBT2GPT program is next in the command-line queue for partition scheme conversion! When it comes to changing partition table layouts, this innocent-looking application can punch beyond its weight. Is it a top-secret weapon? It transforms the partition table without affecting the data on the hard drive.

available commands for mbr2gptavailable commands for mbr2gpt

You may also use the Windows Preinstallation Environment to execute MBR2GPT (WinPE).

To convert a disk using the MBR2GPT tool, follow these steps:

1. Log in as an administrator to Windows PowerShell.

2. Locate the disk number that has to be converted. As previously shown, you can get the disk number using the Disk Management GUI or the diskpart software.

Before committing, you may use this command to check if the action is likely to succeed.

3. Execute the conversion command, but first execute the validation conversion. Using the /allowFullOS flag, the program below should convert disk number 0 to GPT and operate from a complete Windows environment. MBR2GPT runs in WinPE by default.

Because the /validate option was used in the tutorial, MBR2GPT scans the disk to check that the conversion is feasible without making any modifications.

allowFullOS mbr2gpt /validate /disk: 0

Remove the /validate switch to do the conversion for real once you’ve validated the conversion can happen. As you can see in the screenshot below, MBR2GPT takes care of all existing partitions while performing a clean conversion.

allowFullOS mbr2gpt /convert /disk: 0

MBR to GPT conversion using mbr2gptMBR to GPT conversion using mbr2gpt

Using Windows settings to convert BIOS to EFI

Despite the fact that you now have a GPT disk, Windows will not recognize it. You must “upgrade” your computer’s BIOS to UEFI to enable Windows to utilize a GPT drive.

Be aware that this operation will convert your PC’s firmware from BIOS to UEFI, so proceed with caution. Although this procedure is reversible, it is not without danger. Always keep an offline backup of any crucial information. This update affects the system’s firmware settings, which might result in data loss if done incorrectly.

1. Open the Update & Security applet by clicking on Start —> Settings —> Update & Security.

2. In the Update & Security applet, click on Recovery to access the Advanced Recovery Options screen.

Control Panel - Windows Update & Security windowControl Panel – Windows Update & Security window

3. Press the Restart Now button to put the computer in safe mode. Windows 10 will restart automatically.

Control Panel - Recovery windowRecovery pane in the Control Panel

4. You’ll enter safe mode after a reboot. Click Troubleshoot from here.

Menu - Start troubleshootingStart troubleshooting from the menu

5. Select Advanced options from the Troubleshoot box.

Menu - Advanced OptionsAdvanced Options – Menu

6. In the Advanced options panel, choose UEFI Firmware settings.

Menu - UEFI Firmware SettingsUEFI Firmware Settings – Menu

7. Click the Restart button on the UEFI Firmware Settings screen to restart the machine and begin the firmware update.

Menu - UEFI Firmware Settings window UEFI Firmware Settings – Menu window

After that, your PC will boot into Windows again, giving you all of the advantages of UEFI, such as quicker start-up, shutdown, sleep, and resume. Secure Boot, Device Guard, and Credential Guard are all included as well.


By changing your MBR disks to GPT and updating your vintage BIOS to contemporary UEFI, this guide has brought you from 1970s technology to the twenty-first century. You’ve learnt three distinct methods for upgrading your hard drives to a current level that will please even the most discerning among you.

So, now that your PC is equipped with the most cutting-edge technology, how do you intend to put your newfound knowledge to use?

The “how to convert mbr to gpt using cmd” is a step-by-step guide on how to convert MBR to GPT and GPT to MBR.

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