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For added security, Windows 11 will forgo the old MBR partition scheme and use GPT instead. That may require users to convert their older hard drives. This is how you do it.
Current Windows 10 users who plan to upgrade their operating systems to Windows 11 when it launches in October 2021 will first need to meet several strict, non-negotiable prerequisites. For example, in its attempt to make Windows PCs more secure, Microsoft requires that personal computers running Windows 11 also use the Unified Extensible Firmware Interface firmware installed on motherboards.
To access the enhanced security features of UEFI, Windows 11 will forgo the old Master Boot Record (MBR) partition scheme and instead use the modern GUID Partition Table (GPT) scheme. If your Windows 10 computer still uses MBR, you will need to convert it to GPT before you will be allowed to upgrade to Windows 11.
How to Convert MBR Hard Drive Partitions to GPT
To determine if you have UEFI on your PC, you will have to access the system software for your particular motherboard. Unfortunately, there is no standard motherboard system software; each manufacturer has its own. Therefore, you will have to figure out how to access your system on your own. Generally, the technique involves pressing a specific key while the system is booting.
To determine if a hard drive is formatted with MBR or UEFI, right-click the Start menu button and select Disk Management from the context list. On the Disk Management screen, right-click a hard drive request, select Properties, and then select the Volumes tab. The format type will be revealed.
Converting an MBR partition to a UEFI partition is accomplished with the help of a simple utility in Windows 10 called MBR2GPT.exe, which is accessed from the administrative command line. The important thing to note about this utility is that it will perform the conversion without losing or overwriting any of your existing data. The MBR2GPT.exe utility requires Windows 10 version 1703 or higher, so it may be beneficial to run an update before running the utility.
When you’re ready to convert, right-click the Start Menu button in Windows 10 and select the administrative command line from the context menu. Your options are Windows PowerShell (Admin) or Command Prompt (Admin), depending on how you have chosen your installation.
As a precaution, you must first validate that a conversion from MBR to GPT is feasible by entering this command at the prompt,
My hard drive is already GPT so the validation failed, but you get the idea. If the utility returns “MBR2GPT: Validation completed successfully” then you know that you are ready for the main command, which is:
mbr2gpt.exe / convert / allowfullos
Assuming the conversion is successful, you will have to restart your computer, but when you do, you need to access the motherboard system software to change the boot partition settings from MBR to UEFI before Windows 10 starts its boot process.
Assuming you’ve met all of Microsoft’s other prerequisites for Windows 11, your newly converted GPT version of Windows 10 should now be ready for the October 2021 update to the next generation.
Final remarks: How you can convert MBR hard drive partitions to GPT
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