I just ordered the Thunderbolt version of the LaCie 2 Big drive to use as both a Time Machine drive and additional storage space. I read one user review of the drive that was negative because the user said he could not partition the drive under RAID 1. It seems to me the solution to this is to partition each of the 2gb drives into 1tb partitions and then pair a partition from one drive with an equal sized partition from the other drive using Apple's Disk Utility. Then one pair of partitions can act as my RAID 1 Time Machine drive and the other pair can be used for additional space. Has anyone done this or see any reason why it won't work. Looking at the Disk Utility RAID tab it indicates you can create a RAID 1 array using either disks or partitions.