Stefan Mileschin

The fellas at NikKTech have just published a review of the HGST Ultrastar He6 6TB SAS hard drive today. For the Ultrastar He6 line of HDDs HGST took a different path and so instead of using regular air inside the drive just like every HDD out in the market currently they decided to use the much lighter Helium gas. So since Helium has one-seventh the density of air it allows for all 7 disks/platters inside the drive to spin easier and thus faster due to less resistance/friction which in turn naturally results in reduced power demands and temperatures.

http://www.hardocp.com/news/2014/09/...as_hdd_review/