I am mid switch from a mac pro 2009 to a 2011 ultimate iMac with a thunderbolt display on a BOA II arm, I am looking at storage options, I have specced the SSD and 2TB drive, but I will use more, I have another 3 x3TB Hitachi's in the Mac Pro. I have bought an OWC enclosure to hold two of the drives, probably as JBOD as a backup. I want to buy the Pegasus R6, but need some help on RAID and how I can practically use it. I also have a Synology Ds1511+ and DX510 full of 2TB drives that we use for Media and time machine 9 and 4 TB respectively and growing!!! So I want a separate ultra fast storage for the iMac. I know its overkill for a personal machine but its my only vice!!!!!! My questions are: In Raid 5 then it would appear as one big disk, 9.7TB in the case of the R6? Can I have individual folders within here, such as iTunes, crashplan backup, download storage? Can I have two volumes within one R6? Does anyone know if and when it was full, I could just replace the drives with 3TB drives, is it possible to upgrade them one by one, or do I have to start again? If I want to backup a thunderbolt volume will it be seen by time machine? Thanks in advance for any input.