Applies To: Windows 11, Windows 10, Windows Server 2022, Windows Server 2019, Windows Server 2016

Master Boot Record (MBR) disks use the standard BIOS partition table. GUID partition table (GPT) disks use the Unified Extensible Firmware Interface (UEFI). One advantage of GPT disks is that you can have more than four partitions on each disk. GPT is also required for disks larger than 2 terabytes (TB).

You can change a disk from MBR to GPT partition format as long as the disk contains no partitions or volumes.

Convert an MBR disk with Disk Management

To complete the disk conversion by using Disk Management, follow these steps.

The process notifies you when the conversion completes.

Convert an MBR disk from the command line

To complete the disk conversion from the command line with the diskpart disk partition process, follow these steps.

The diskpart process notifies you when the conversion completes.

The following table shows a summary of the commands for the diskpart process.

Try the MBR2GPT conversion tool

As an alternate approach, you can use the MBR2GPT.EXE tool to convert the MBR disk to the GPT partition format. Keep in mind that the tool can be more complicated to use than the diskpart process. For details, see Convert MBR partition to GPT.


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