PC_SLICE_FLAG
PC_SLICE_FLAG (mbr, entry) = 0;
PC_SLICE_FLAG (BOOT_PART_TABLE, i) = 0;
if (PC_SLICE_FLAG (mbr, part) != PC_SLICE_FLAG_BOOTABLE)
PC_SLICE_FLAG (mbr, i) = 0;
PC_SLICE_FLAG (mbr, part) = PC_SLICE_FLAG_BOOTABLE;