NTSTATUS
FstubWriteBootSectorEFI(
  IN  CONST PDISK_INFORMATION Disk
  );

Routine Description:

    Write the boot sector for an EFI partitioned disk. Note that the EFI
    boot sector uses the structure as the legacy AT-style MBR, but it
    contains only one partition entry and that entry covers the entire disk.

Arguments:

    Disk - The disk to write the MBR for.

Return Values:

    NTSTATUS code.