Western Digital have unveiled the worlds first 10 TB hard drive.
Helium filled and using shingled recording technology.
Great for archiving large amounts of data.

Helium is hermetically sealed inside, allowing more platters to be used by reducing friction, and cutting down on heat produced.

http://www.extremetech.com/computing/189813-western-digital-unveils-worlds-first-10tb-hard-drive-helium-filled-shingled-recording