![]() MBR2GPT: Conversion completed successfully MBR2GPT: Performing the layout conversion MBR2GPT: Creating the EFI system partition MBR2GPT: Trying to shrink the OS partition MBR2GPT: Trying to shrink the system partition MBR2GPT: Validating layout, disk sector size is: 512 bytes If conversion is successful the disk can only be booted in GPT mode. MBR2GPT will now attempt to convert disk 0. * Volume 2 D Windows NTFS Partition 58 GB Healthy Volume 3 E Recovery NTFS Partition 612 MB Healthy Hidden Volume 2 D Windows NTFS Partition 58 GB Healthy Volume 1 C System Rese NTFS Partition 499 MB Healthy Volume 0 F CENA_X64FRE UDF DVD-ROM 4027 MB Healthy Volume # Ltr Label Fs Type Size Status Info The detail displays that the OS volume is converted to the GPT partition type of ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 corresponding to the PARTITION_BASIC_DATA_GUID type.Īs noted in the output from the MBR2GPT tool, you must make changes to the computer firmware so that the new EFI system partition boots properly.Įxpand to show MBR2GPT example X:\>DiskPart.exe The new disk layout is displayed - four partitions are present on the GPT disk: three are identical to the previous partitions and one is the new EFI system partition (volume 3). The DiskPart tool displays that disk 0 is now using the GPT format. The MBR2GPT tool is used to convert disk 0. The MBR partition type is 07 corresponding to the installable file system (IFS) type. The OS volume is selected, partitions are listed, and partition details are displayed for the OS partition. ![]() The current disk partition layout is displayed prior to conversion using DiskPart - three partitions are present on the MBR disk (disk 0): MBR2GPT: Validation completed successfully MBR2GPT: Validating layout, disk sector size is: 512 Errors and warnings are logged to the default location of %windir%. In the following example, disk 0 is validated for conversion. In this case, a new EFI system partition is created by shrinking the OS partition. Note: Since the existing MBR system partition is in use while running the full Windows environment, it can't be reused. This option overrides this block and enables disk conversion while running in the full Windows environment. Multiple /map options can be specified if multiple mappings are required.īy default, MBR2GPT.exe can only run from Windows PE and is blocked from running in full Windows. The GPT GUID can contain brackets, for example: /map:42=. The MBR partition number is specified in decimal notation, not hexadecimal. Specifies other partition type mappings between MBR and GPT. If specified, the directory must already exist, it isn't automatically created or overwritten. Specifies the directory where MBR2GPT.exe logs should be written. The mechanism used is the same as used by the diskpart.exe tool SELECT DISK SYSTEM command. If not specified, the system disk is used. Specifies the disk number of the disk to be converted to GPT. Instructs MBR2GPT.exe to perform the disk validation and to proceed with the conversion if all validation tests pass. Instructs MBR2GPT.exe to perform only the disk validation steps and report whether the disk is eligible for conversion. If any of these checks fails, the conversion doesn't proceed, and an error is returned. All partitions on the disk are of MBR types recognized by Windows or has a mapping specified using the /map command-line option.The volume IDs can be retrieved for each volume that has a drive letter assigned. ![]() The BCD store on the system partition contains a default OS entry pointing to an OS partition.The disk doesn't have any extended/logical partition.One of the partitions is set as active and is the system partition.There are at most three primary partitions in the MBR partition table.16 KB + 1 sector at the end of the disk.16 KB + 2 sectors at the front of the disk.There's enough space not occupied by partitions to store the primary and secondary GPTs:.Disk Prerequisitesīefore any change to the disk is made, MBR2GPT validates the layout and geometry of the selected disk to ensure that: Make sure that your device supports UEFI before attempting to convert the disk. After the disk has been converted to GPT partition style, the firmware must be reconfigured to boot in UEFI mode.
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