I have all my music on an external hard drive that goes into my Mac Mini (Mach2Music). I ordered power cord from the PI Group for my Mac Mini and of course have after market power cords for other components and a USB cord from DB Labs going into my Tranquility SE. However, what about the cord that connects the hard drive to the Mac Mini? Do they make aftermarket cords for this that would improve performance? Is something like that even necessary?