I installed Mountain Lion on my external HDD a while ago, just to test it and the new XCode out, but without realizing what I was doing, I adopted it as my main OS. Now I am stuck having my external HDD plugged in all the time. I was wondering if there is some way to port my OS to my internal HDD.
Preferably, I would also like to keep my internal OS on my external HDD. I have a partition that is big enough to hold my entire internal OS.