In this video, I talk about USB drive options to use with a Raspberry Pi and I do an overview of configuring a Pi to boot from a USB drive. In the video, I install Ubuntu 14.04 LTS on a Raspberry Pi 2. This also works with Raspbian which will work on a Raspberry Pi 1 or 2.
NOTE: An SD card is still required because the Raspberry Pi doesn’t have a traditional BIOS and thus stores initial boot information on the SD card. See https://www.raspberrypi.org/help/faqs/ and look for “13. HOW DOES IT BOOT?”.
Ubuntu 14.04 LTS image is available here:https://wiki.ubuntu.com/ARM/RaspberryPi
Raspbian image download:https://www.raspberrypi.org/downloads/
Installing Ubuntu 14.04 LTS on a Raspberry Pi 2:https://youtu.be/UGSQ7nzVCs4
Raspberry Pi Playlist: https://www.youtube.com/playlist?list=PLErU2HjQZ_ZPvIdR5BEqDgO7DsGAla_AZ
Raspberry Pi (Amazon Affiliate)