Expanding the root parition of the SD card in Arch Linux

rpi-model-b-setup.md

Raspberry Pi Model B

Expanding the root parition of the SD card

Whilst booted into Arch on the pi:

fdisk /dev/mmcblk0

Delete the second partition /dev/mmcblk0p2:

d
2

Create a new primary partition and use default sizes prompted. This will then create a partiton that fills the disk:

n
p
2
enter
enter

Save and exit fdisk:

w

Now reboot. Once rebooted:

resize2fs /dev/mmcblk0p2

Source: http://archlinuxarm.org/forum/viewtopic.php?p=18160&sid=7daca906d1d8b7d3728c1a748ae7f6a3#p18160