how to convert MBR to GPT

1. Convert MBR to GPT using Diskpart

This method you have to backup all your data and delete all partitions and volumes. Then use the DISKPART command.

• Open command prompt and type in DISKPART and press Enter
• Then type in list disk  (Note down the number of disk you want to convert to GPT)
• Then type in select disk number of disk
• Finally type in convert gpt.

2. Convert MBR to GPT without data loss using Gptgen

Using this method you can convert MBR to GPT without loosing data, using a command line utility called gptgen. Gptgen is a tool designed to non-destructively convert hard disks partitioned in the common, “MSDOS-style” MBR scheme (including extended partitions) to use a GUID partition table (GPT).

3. Convert MBR to GPT without losing data using Partition Assistant

The last method is using a tool called AOMEI Partition Assistant Lite Edition. It’s a free multifunction partition management software. This tool’s feature can help you convert a disk with data into GPT or MBR style without data loss.
NOTE: It appears that now the free version of Partition Assistant does not allow converting MBR to GPT.
To convert a disk to MBR/GPT disk:

• Select the disk to convert;
• Right click the disk and select Convert to GPT/MBR Disk;
• Confirm your operation, by clicking “OK” to continue;
• Click Apply button on the toolbar to commit the changes