The EARS has the bigger cache than the EADS, but a green is a data drive anyway. I picked up a couple of the 2TB in the nicx sale last week, mounted one internal, swapped it out with my 150GB raptor data drive, holds so much more eh. The problem with external enclosures is always heat, not sure if I'd trust a passive cooling system, for a sealed type external, I'd want some fannage. What I've had for a few months is one of the dual drive Thermaltake BlacX's which can be used usb or e-sata. However, I rarely use it, internal is much healthier for the drives.
As mentioned above, e-sata is the way to go, much faster than the usb interface. And, as an added bonus, when your drive appears toasted, diagnostics and recovery progs run much better when the connection is e-sata. No extra level of translation back and forth through the usb.
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