I've installed NOOBS v1.4.0 Raspbian - wheezy on one 8GB SD card for my my PI 2. On another 8GB card I've installed RISC-OS.
It would be nice to have the option of selecting either Raspbian or RISC-OS at bootup without having to switch SD cards as I'm told the SD connections are not too robust and may not stand more than tens of changes before failure.
I'm confused about whether it's possible to install more than one OS on a 8GB SD card. What exactly is the procedure? Do I need to erase and re-format an SD card before starting?