Can the hybrid drive be split into separate volumes? I don't want the OS deciding what is "important" enough to be on the SSD. I liked the dual drive option in the 2011 iMac, but the current $1300 for an oversize SSD and no HD option was a bad marketing choice. I could buy an entire top-end Mac Mini for that cash with $400 left over to buy a 512GB SSD! However, if the fusion hybrid drive could be split I would have the perfect combo of 128GB SSD and 1TB HD!