GPT fdisk (gdisk) version 1.0.1
Type device filename, or press <Enter> to exit: /dev/sda
Command (? for help): r
Recovery/transformation command (? for help): g
MBR command (? for help): ?
a    toggle the active/boot flag
c    recompute all CHS values
l    set partition as logical
o    omit partition
p    print the MBR partition table
q    quit without saving changes
r    set partition as primary
s    sort MBR partitions
t    change partition type code
w    write the MBR partition table to disk and exit