Being a film student I need lots of HDD space to edit and store films. I couldn't afford any more than 256 GB of space in my rMBP and need an need a portable external hard drive. (I have 2 WD studio's filled already) I would love to use thunderbolt, but I can't find any drives that use it. I guess USB 3.0 would be adequate. What are the best portable hard drives? And can you give links Thanks Moss.