Hello, I have a late 2009 imac with a 1 terabyte hard drive in it. I'm starting to run out of space on the mac because of my video projects and bootcamp and I want to upgrade to a 2 TB hard drive. Now I know that osx runs on an external hard drive but it takes about 3 to 4 minutes on average compared to 30 seconds for an internal hard drive. I want to replace the internal hard drive on my imac but I'm afraid of breaking the screen while doing so because from what I've heard, you have to take the glass off the screen and get into the heart of the computer. I'm also afraid of voiding my warranty so I want to know if I can get someone at an apple store to do it. I also want to know if you can run windows 7 from an external hard drive and if its worth doing it that way. If Apple can't help me, I would like if you guys explained to me the easiest way to replace the hard drive on a imac since I haven't really worked with the innards of computers that much. Any and all help would be appreciated, I want as much space as I can possibly get. I also want to know this because I have an old imac that I'm thinking of turning it into a home server for video and music, thanks for the help .