One thing I haven't quite figured out from reading all the threads is how well external drives work on a day to day basis if the internal drive is small. if I get a new Mac mini with a 256 gb SSD, it will be too small to hold my iTunes, Aperture and iMovie files and libraries. If I put these on an external HDD, will there be a performance hit when working in these applications? Or does USB 3 or TB eliminate any such issues and it will be just like having the files on an internal drive? To keep costs down the external drive would be just a regular HDD (not a SDD). Maybe I'm better off with a fusion drive. Im just not sure. Any help or guidance for this novice would be much appreciated. Thanks.