While the first two methods are good for converting non-system hard drives from MBR partition style to GPT, mbr2gpt is the ultimate tool for converting any kind of drive to GPT. I’ve had great success using the mbr2gpt tool. X is the disk number you have from diskpart Conclusion If you are running Windows 10, use the following command mbr2gpt /convert /disk: X /allowfullOS X is the disk number you have from diskpart If you are running the tool on WinPE, use the following command mbr2gpt /convert /disk: X Use the following commands to run the tool, depending on the environment. All volumes have valid, retrievable volume ID’s with drive letters.One partition is set active and configured as system partition, while the BCD store has a default OS and that in turn directs to the OS partition.The number of primary partitions on target does not exceed 3.Space required by both primary and secondary GPT’s (16KB + 2 sectors at the front, while 16KB + 1 sector at the end).If not, then you need to specify mapping using /map. Current partition: Must be MBR, and of a type that Windows 10 can recognize.Any errors after the firmware has been converted can brick the PC until manual conversion back to BIOS is successful.Īs this tool is for a specific task, we will run a checklist before executing the convert command, this includes the following: Failing any of the checks will not run the command. However, it is recommended that it is run before you convert the BIOS to UEFI, in WinPE. This tool has been designed to be run from Windows PE (Preinstallation Environment), however, the /allowFullOS command can be used to run it from the full operating system. If you want even more control over the conversion process, you can use the MBR2GPT tool included in the later versions of Windows 10, build 1703 and above. These are the methods that use utilities available within Windows 10 that anyone can use. If you want to convert the system disk, you may use the next method which is using the mbr2gpt tool. One more thing to note here is that the graphical tool will not be able to convert the system disk (where Windows is installed) to GPT or MBR. Please note that if your disk is already GPT, you will get an option to convert GPT to MBR. Select the disk you want to convert and then go to Actions menu –> All tasks –> Convert to GPT.This will open the Disk Management console. Open the Run dialog (Windows key + R) and type diskmgmt.msc.Simply follow the steps given below to convert an MBR disk to GPT. As it allows viewing and management of disk drives on a PC, it can also be used to convert MBR to GPT without data loss.

Dynamic disk converter free