how to create Raspberry Pi SD card via Linux command line
http://n00blab.com/how-to-create-raspberry-pi-sd-card/
http://www.youtube.com/watch?feature=player_embedded&v=uq3-aydRMv0
This tutorial will walk you through how to create Raspberry Pi SD card via Linux command line (Ubuntu 12.04 LTS)
Instructions for creating the SD card on Windows or Mac are found here
Download desired image via torrent or direct download and place in your Downloads directory:
http://www.raspberrypi.org/downloads
Check the hash:
sha1sum ~/Downloads/2012-08-16-wheezy-raspbian.zip | grep 63d16fd28369b6e05bf97f2d1758d56df6ed0ba9
If the hash checks out, unzip:
unzip ~/Downloads/2012-08-16-wheezy-raspbian.zip
Insert your SD into your card reader and run:
(if unsure of your computer’s naming convention, run prior to inserting SD then again after to identify mounted card)
df -h
Unmount your card: (sdb1 was mine, yours may be named differently. If your card shows up more than once – ie. multiple partitions – be sure to unmount all of them!)
umount /dev/sdb1
Write the image to the card. Note that I have left off the trailing 1 (/dev/sda) as I want to write to the entire card:
dd bs=1M if=~/Downloads/2012-08-16-wheezy-raspbian.img of=/dev/sdb
To ensure write cache is empty and it is safe to unmount run:
sudo sync
DONE!
Stay tuned for a follow up video outlining what to do now that you have your SD ready to go!