Making the move to Blu-Ray. I want to download all the iTunes movies I've bought so I have them locally and want to know how to connect the external to the pc that will drive that machine. Essentially, it'll be a cheap Win PC with iTunes installed connected to an external 1tb (maybe larger) to stream across the local network to an ATV 4K. Is USB 3 fast enough? Ideally a Mac Mini w/HDMI would be great but not at the price they are asking. IS Synology an option without having to have a PC front end?