[M] Toshiba N300 12TB NAS Hard Drive Review
 

The N300 12TB drive from Toshiba incorporates 1.56TB PMR platters by Showa Denko and is helium-filled. Compared to regular, up 10TB models, the HDD produces less noise, consumes less power and is even lighter! The advertised Stable Platter Technology means that the motor is attached to both top and bottom in order to minimize the vibrations, while the RV sensors do ensure a stable transfer rate while operating in a multi-drive environment.

http://www.madshrimps.be/articles/article/1001231/