Press “Windows Key + R to open the run dialogue box,

Type“diskpart” and double click “Diskpart – run command” to open a command prompt window.

 

Type “list disk” > Enter

“select disk n” ( where n = disk number ) > Enter

Type “list partition” to display all the volumes on the hard drive.

Type “select partition n” ( n stands for the volume ).

Type “delete partition override” to remove the EFI partition.

Type “exit” to close the diskpart window