I recently put a crucial m4 128gb ssd into my late 2008 macbook as well as added a 1tb hdd in place of the optical drive. I love it. I am thinking of upgrading to ML however I'm not sure how to go about doing it. The ssd has my apps and things and the HDD has my user things. Do I need to install ML on both the ssd and the HDD? Or can I install only on the sad? I have no idea what to do and I am nervous because I don't want to lose my data. Not to mention I have read about bad things that have happened to people's computers after this same task I plan on doing. Any help would be much appreciated. Thanks in advance.