Hi all, I got a 2012 Mac Mini recently. I wanted to add an SSD to boot off/run programs, and keep the original HDD for storage as many have done on here. However, my SSD is one I previously used with my MacBook. Since it has OS X installed, and the new HDD that came with the Mac Mini also has OS X installed, how do I go about adding the SSD (which I want to format and upgrade to Yosemite)? Can I just turn on the Mac Mini and select the SSD to boot from and then format the HDD and not have an OS X on it? Or turn on the Mac Mini and just format the HDD before booting into the OS? TIA.