I currently have a DroboPro with 2-4TB drives and 6-2TB drives. The Drobo is connected to my IMAC 27 by ISCCI. My IMAC is also Thunderbolt capable also, but the Drobo is not and I was considering buying the 8TB G-Tech unit with Thunderbolt, and running it as my live editing platform in RAID 1 mode.. Can I run both drives on the IMAC simultaneously? Will FCP just draw from wherever the content is and how much will that increase my speed in editing or degrade it overall?