I know this sounds crazy, but I would like to purchase a 5k iMac with the 1 TB flash storage option, and then open it up and install a 6 TB hard drive. Then, I would like to use terminal commands to make my own 7 TB fusion drive A 7 TB fusion drive would allow me to fit all of my media files without the need for an external drive (except for a backup drive). I have built fusion drives before using Terminal commands and have upgraded iMac computers in the past and am pretty tech savvy. I know this will void the warranty. Can this be done?