I have a mid2010 iMac with USB2 and FW800 ports only (no USB3 nor TBolt), and i want to purchase a drive bay to place drives that will reach around 6TB, 2TB for storage and 4TB for backup with TimeMachine. Is there something around that i can use with passive cooling? Those WD myBookStudio drives were great but they don't max up to that capacities i need, nor do they come with the ports that i use on the iMac! There are some NAS's that are great (WD EX2) but they are NAS's and i don't want them, i prefer good old traditional drive bays. Any thoughts on my issue?