I've just spent 2 hours trying to convert my new Samsung SSD (as a boot drive) from MBR to GPT. First time I upgraded from Win 7 64-bit to Win 8.1 64-bit (booting from the Windows DVD), disk ...

Learn how to convert MBR to GPT disk without data loss in Windows 11/10, using Diskpart, Gptgen, or AOMEI Partition Assistant. MBR disks support only 4 partition tables.