I just purchased a LaCie 2Big thunderbolt drive for my new rMBP. I'll be using it to supplement the smaller drive in the laptop. Along with music, movies, and images I'll also be using it to hold a windows VM. However, temporarily it is holding the files I need to backup from my iMac as I transition to the rMBP. And since I'm changing computers I can't currently set it up as a RAID 0 enclosure. So my question is, for my usage will I see a real performance difference between using each volume as opposed to setting them up in RAID 0. If there's a big upside I will move all my files onto my slower USB drive, then setup the 2Big and then move them back. Thanks.