Creating an Arch Install on a 2nd SD card in raspbian

[asonofmre]

I've been trying like crazy to get Arch on my Raspberry pi, I've been to the arch wiki for it and followed the instructions but these are for people who already have an arch system installed. My only other computer is a work laptop so I can't install any software on it.
I have manage to create the partitions using fdisk, but I'm getting stuck unpacking the Arch tar...My second SD card seems to be mounted /media/pi so when I follow the instructions on the wiki page, I can't complete this step:
mkdir boot
mount /dev/sdX1 boot
Can anybody tell me what I'm missing (apart from a brain smile )

[summers]

Are you doing this as root?

That command is just to create a mount point (boot) and then to mount the SD card on the mount point. have you created a file system on the partition with mkfs.vfat /dev/sdX1

Make sure the /dev/sdX1 matches the /dev/sdX you fed into fdisk - I'm expecting X to equal something like b:

$this->bbcode_second_pass_code('', '
sudo fdisk /dev/sdb
sudo mkfs.vfat /dev/sdb1
mkdir boot
sudo mount /dev/sdb1 boot
')