Convert a MBR to GPT

To use the Diskpart command-line utility to change a disk from MBR to GPT partition style, perform the following procedure:

1. Back up the data on the basic MBR disk that you want to convert.
2. Open an elevated command prompt and enter diskpart.
3. At the DISKPART> prompt, enter list volume. Note all the volume numbers.
4. For each volume listed, at the DISKPART> prompt, enter select volume <volumenumber>
5. For each volume, at the DISKPART> prompt, enter delete volume.
6. At the DISKPART> prompt, enter list disk. Note the disk number of the disk that you want to convert.
7. At the DISKPART> prompt, enter select disk <disknumber>.
8. At the DISKPART> prompt, enter convert gpt.

You can also use both Disk Manager and the Diskpart utility to