Need Help with triple booting Ubuntu, Windows and Chromium OS

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http://askubuntu.com – I have a dual boot system, with Ubuntu 12.04 and Windows 8. I'm kinda new to all this, and was just wondering how I can have a triple boot system, by adding Chromium OS to my machine. I'm able to boot, and run Chromium OS without much problems from a LiveUSB created through terminal in Ubuntu. I did some research and found that I need to have more than one HDD to have a multi-boot system with Chromium. However, I'm unwilling to get a new HDD, and also it wouldn't fit into my laptop. I also read that when Chromium is installed to a HDD, it gets completely formatted. Again, I do not want that, b (HowTos)