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.
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