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root@OpenWrt:/# fdisk /dev/mmcblk0
 
Welcome to fdisk (util-linux 2.28.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
 
 
Command (m for help): p
Disk /dev/mmcblk0: 7.3 GiB, 7818182656 bytes, 15269888 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x15488508
 
Device         Boot Start    End Sectors   Size Id Type
/dev/mmcblk0p1 *     2048  35327   33280  16.3M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      36864 561663  524800 256.3M 83 Linux

 
Command (m for help): n
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p):
Using default response p.
Partition number (3,4, default 3):
First sector (35328-15269887, default 563200):
Last sector, +sectors or +size{K,M,G,T,P} (563200-15269887, default 15269887): 596479
 
Created a new partition 3 of type 'Linux' and of size 16.3 MiB.

Command (m for help): n
Partition type
p primary (3 primary, 0 extended, 1 free)
e extended (container for logical partitions)
Select (default e): e

Selected partition 4
First sector (35328-15269887, default 598016):
Last sector, +sectors or +size{K,M,G,T,P} (598016-15269887, default 15269887):

Created a new partition 4 of type 'Extended' and of size 7 GiB.

Command (m for help): n
All primary partitions are in use.
Adding logical partition 5
First sector (600064-15269887, default 600064):
Last sector, +sectors or +size{K,M,G,T,P} (600064-15269887, default 15269887): +512M

Created a new partition 5 of type 'Linux' and of size 512 MiB.

Command (m for help): n
All primary partitions are in use.
Adding logical partition 6
First sector (1650688-15269887, default 1650688):
Last sector, +sectors or +size{K,M,G,T,P} (1650688-15269887, default 15269887): +64M

Created a new partition 6 of type 'Linux' and of size 64 MiB.

Command (m for help): p
Disk /dev/mmcblk0: 7.3 GiB, 7818182656 bytes, 15269888 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x15488508

Device      Boot Start End Sectors Size Id Type
/dev/mmcblk0p1 * 2048 35327 33280 16.3M c W95 FAT32 (LBA)
/dev/mmcblk0p2   36864 561663 524800 256.3M 83 Linux
/dev/mmcblk0p3   563200 596479 33280 16.3M 83 Linux
/dev/mmcblk0p4   598016 15269887 14671872 7G 5 Extended
/dev/mmcblk0p5   600064 1648639 1048576 512M 83 Linux
/dev/mmcblk0p6   1650688 1781759 131072 64M 83 Linux

Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Resource busy

The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).

 
root@OpenWrt:/# reboot