How to change the firmware mode from BIOS to UEFIĪfter converting the drive to the GPT style, the computer will no longer start until you change the firmware type from BIOS to UEFI in the motherboard. While MBR-style drives can have up to four primary partitions, the drive you want to convert can't have more than three partitions because one additional allocation is required to create the UEFI partition.įinally, Microsoft designed the tool to convert drives running Windows 8.1, 7, or from an older version, but you can always upgrade the installation to the latest release of Windows 10 and then use the tool to convert from MBR to GPT. When dealing with a drive using file encryption with BitLocker, you must first suspend the encryption before following the outlined instructions. You can use the MBR2GPT tool on a traditional hard drive (HDD), solid-state drive (SSD), or an M.2 drive with virtually any version of Windows 10, but you must run the tool from a Windows 10 (version 1703 or later) installation. Successful conversion, but some boot configuration data didn't restore. Geometry and layout of the disk don't meet requirements.Įrror while creating the EFI system partition.

One or more volumes on the disk are encrypted.

Error on the geometry and layout of the selected disk.

Mini disk partition