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Unfortunately, my PC only has an internal 120GB SSD, and I only have 37GB of free space available...I suppose that if I do encounter any problems running it from my 2TB external HD, I can always purchase an additional SSD external USB3 HD and copy everything across to that.


If you have only a 120gig SSD, as mentioned before it would be a good idea to price a 240gig - 256 - 480 SSD to replace the main with a simple clone, unless you have the Audiophile that needs a 2T drive.
You can put the old 120gig SSD in a USB 3 enclosure.