I just bought a quad-core 2012 Mini after seeing the new spec removed this option. It's the base 4Gb, 1Tb and I plan to upgrade the Ram and move to SSD. I actually probably hardly need the 1Tb disk, my old PC is 5 years old and the 500Gb disk is only half full! I am considering a DIY Fusion drive or adding the SSD as 2nd disk with a conversion kit but I don't really want to start taking it apart, I can do it but would rather not spend the time. So my other option is an external drive. But what interface? I have USB3, thunderbolt and firewire - and no idea which would be best. I also saw someone mention you can buy an internal drive and an external caddy - so you can change your mind later and install it internally. Any general advice welcome. I'm pretty technical (a software developer) but don't want to spend loads of time on this since I'm just too plain busy! Thankyou.