I have a Mid 2011 Mac mini with a 2.7 GHz Intel Core i7, 8 Gig of memory, and a 750GB hard drive running Yosemite 10.10.3. It has performed flawlessly since I opened it Christmas morning 2011. I run MOTU Digital Performer to do small recording jobs (8 tracks or less). I'm getting into a bit of heavier work, so I'd like to add a second hard drive; a SSD to be exact. Should it be used as the OS drive or the recording drive?