How to convert a GPT (GUID Partition Table) hard disk to MBR

1.Open up command prompt
2. Type "diskpart" and press Enter. You will be presented with a DISKPART prompt.
3. Select the hard disk you wish to clean by using the select disk command. By default, the primary hard disk is classified as hard disk 0. Type in "list disk". Find the number of the disk you want. Then type in "select disk x" x = number of the disk you want
4. Type in "clean"
5. Open up Disk Management, and you will find it has a new disk to initialize, make sure you check mbr this time