Convert GPT disk to MBR disk with Windows Disk Management

1. Right click "My Computer" and choose "Manage" -> "Storage" -> "Disk Management".
2. Right-click the GPT hard disk which you want to convert to MBR disk and choose "Delete volume". This action would cause data loss if there are important data in your disk volume. And it's highly recommended for you to backup important data in GPT before deleting volumes on it.

3. Right click on the GPT disk (which becomes new volume after deleting all volumes on it) and choose "Convert to MBR Disk". After you convert GPT disk to MBR disk, you can create partitions on the now MBR disk if you like.

Tips to convert gpt to mbr with Disk Management:

1. You must have administrator privilege to do this in Windows.
2. Before you convert a disk, be sure to backup anything on the GPT disk that you want to convert to MBR disk. Converting the disk requires that all partitions and volumes are deleted on the disk first.