Stefan Mileschin

Western Digital on Tuesday introduced its fourth-generation enterprise-class hard drives filled with helium. The HGST Ultrastar He12 HDD can store up to 12 TB of data, whereas its version based on shingled magnetic recording technology has a capacity of 14 TB (note, both are under the He12 brand). It is noteworthy that to increase the capacity of the HDD, Western Digital had to increase both the amount of platters in the new drives as well as their areal density.

http://www.anandtech.com/show/10888/...and-14-tb-hdds