Sorry the Mini's use 2.5" drives so you're limited here on what available in this form factor. So far there are no traditional HD's that large that would fit.
So far the best you can do with traditional drives is 2 TB. I have a dual Spinpoint 2TB HD (4 TB total) Mini as my media server.
Now if you want to go bigger you'll need to go with SSD's using two Samsung 4 TB SSD drives which would get you 8 TB total!
But it will cost you big time!!
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