I have a 17" MacBook Pro (mid-2010) and wanted to partition the drive in it. If I do this, will I loose or mess up all the programs installed? Basically, I have Snow Leopard and want to install Mt. Lion but, I don't want to loose or mess up anything I'm currently using (like FCP 7). So, if I partition my drive I could keep Snow Leopard on half and install Mt. Lion on the other.
Sure. Just clone your drive before experimenting. You can try out all your stuff on the new OS and when you're happy, clone the new OS partition, wipe the drive clean and clone it back. Or you could leave your drive alone and set up the new OS on an external drive.
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