Hi,
Thank you for your post.
You can change a disk from MBR to GPT partition style as long as the disk does not contain any partitions or volumes.
Using the disk management UI or DISKPART convert gpt command. Please read
Change a Master Boot Record Disk into a GUID Partition Table Disk article.
If there are more inquiries on this issue, please feel free to let us know.
Regards
Rick Tan
TechNet Community Support
Need to support users over the internet?
click here try our remote control online beta