To answer my own question...
I did some more digging, and surprisingly the answer is not in their Specification Sheet but is in their User Manual, Section 2.1 Specification Summary Table. With 14 heads, 7 discs, that puts it at 1.429 TB per platter. [ http://www.seagate.com/www-content/product-content/ironwolf/en-us/docs/100804010a.pdf ]
Still quite a ways to go to hit 2TB per platter.
I did some more digging, and surprisingly the answer is not in their Specification Sheet but is in their User Manual, Section 2.1 Specification Summary Table. With 14 heads, 7 discs, that puts it at 1.429 TB per platter. [ http://www.seagate.com/www-content/product-content/ironwolf/en-us/docs/100804010a.pdf ]
Still quite a ways to go to hit 2TB per platter.