I have a year old Mac Mini with no USB 3.0 ports. I have a 2T external hard drive connect via Firewire 800 for my media files (mainly movies and tv shows). I would like to pick up some really cheap ($) WD 2T hard drives as backups but they are USB 3.0. Is there an adapter for USB 3.0 to Thunderbolt or Firewire 800? The Thunderbolt & Firewire 800 hard drives seem to be more expensive than USB 3.0 Or does anyone have a better solution? One option is to sell my current Mac Mini and get a new one, but I would prefer not to take this route. Thoughts??