I bought a used Mac Mini late 2012 with installed Yosemite and two drives: SSD 128 GB and HDD 500 GB. I want to create a Fusion Drive and downgrade to Mavericks via bootable USB flash drive. What should I do in which order? 1) Boot into recovery HD and create a Fusion Drive (erasing all data) 2) Install Mavericks on SSD part of Fuzion Drive?
But if I already have a Fusion Drive how do I choose explicitely that I want OS to be installed on SSD not HDD for performance boost?