Presently, I have not seen anyone get any Series3 model past 2TiB. I think there are two expansion options with winMFS. One is to limit the expansion partition to 1TB in size, the other is to extend all the way to the end of the drive. The first option would not give you a substantial increase in usable space, and the second would likely be too much. I cannot say for certain, but I think possibly a 652 box may still have a limitation of 2TB of MFS address space, despite the fact it has a 64 bit MFS. There are more knowledgeable folks than me on this board with regard to that subject, and hopefully one of them will respond.