I'm running Volumio (latest) on a Mac Mini with El Capitan from a USB stick and it boots and runs fine. I'm trying to use the mini's internal HDD for my library. I tried installing Volumio on the hard drive and it worked for a day on my bench. I moved the mini to my audio system and couldn't get it to boot. I had to go back to square , reformat the HDD and reinstall El Capitan which was a PITA. The folder is shared and I can access it with my MacBook Pro using finder under network/john's Mac mini/mini/users/jko/music. Try as I might I can't get this folder to mount it once running Volumio. I could use a step by step guide to do this as I'm a total beginner.