How to Boot Multiple OS's on the Raspberry Pi with BerryBoot

The Raspberry Pi loads an operating system from whatever SD card you insert, allowing a hacker to keep different operating systems on separate SD cards depending on which OS you wish to run. A tool called BerryBoot cuts down on the number of SD cards needed by providing the ability to boot multiple operating systems from a single SD card, similar to Bootcamp for Mac OS X. With BerryBoot, a single 32 GB SD card can hold multiple penetration testing tools and distros. Even handier, BerryBoot can configure the Pi to use an external hard drive or USB thumb drive as the source to boot from... more

from Null Byte « WonderHowTo full article here