sgdisk /dev/mmcblk0 -z -n 1:2048:65535 -c 1:kernel -t 1:8301 -n 2: 65536:4194303 -c 2:rootfs -t 2:8307 -n 3:4194304: -c 3:data -t 3:8300 root@dm920:~# sgdisk /dev/mmcblk0 -z -n 1:2048:65535 -c 1:kernel -t 1:8301 -n 2: 65536:4194303 -c 2:rootfs -t 2:8307 -n 3:4194304: -c 3:data -t 3:8300 [ 2037.360626] mmcblk0: unknown partition table GPT data structures destroyed! You may now partition the disk using fdisk or other utilities. Setting name! partNum is 0 REALLY setting name! Setting name! partNum is 1 REALLY setting name! Setting name! partNum is 2 REALLY setting name! [ 2038.372852] mmcblk0: p1 p2 p3 The operation has completed successfully. root@dm920:~#