I have a Mid 2011 21.5" iMac, i7 built to order with 1 TB drive. I have recently purchased from OWC the hard drive cable with heat sensor and the SSD installation kit. I have also purchased a Seagate 3 TB drive and an OWC Mercury Electra 6G 240 GB SSD. So originally I was going to install both and create a Fusion drive, I plan to do a clean install of Mavericks and will also be installing Parallels 9 to run windows 7 continuously which i have a second monitor for. My question is: Should I go with the Fusion setup or keep the two drives separate with OSX and Windows on the SSD?? But would that mean that I will have to put my iTunes library, Pictures folder etc on the 3TB drive to keep the SSD from filling up? I am certainly willing to do a bit of file maintenance but I am also concerned that my Time Machine backup will get confusing having two separate drives?? I want to do the upgrade this weekend coming so want to be fully prepared before opening up the iMac. I look forward to your learned replies!