What is the purpose of an external SSD Array, via TB2? By this I mean, if you already have an SSD in your computer, what is the advantage of adding (2-4) more externally? Is this configuration primarily for video? If the answer includes, "it processes things faster." My follow up question would be, "how is having an external SSD faster than the internal one the MP comes with?" In short, I need the idiot's guide to advantages of having an external SSD array. Or, if you're having problem xxxx, an SSD array will help considerably. Thank you for your help.