To change a GUID partition table disk into a master boot record disk using command line
-
Back up or move all volumes on the basic GUID
partition table (GPT) disk you want to convert into a master boot record
(MBR) disk.
-
Open an elevated command prompt and type
diskpart
. If the disk does not contain any partitions or volumes, skip to step 6.
-
At the DISKPART prompt (right-click Command Prompt, and then click Run as Administrator), type
list disk
. Make note of the disk number you want to delete.
-
At the DISKPART prompt, type
select disk <disknumber>
.
-
At the DISKPART prompt, type
clean
.
Important Running the clean command will delete all partitions or volumes on the disk.
-
At the DISKPART prompt, type
convert mbr
.