The drives are hermetically sealed and filled with helium, which is one seventh the density of air. Thanks to HGST’s HelioSeal technology, the new drives can be liquid cooled – in fact they are capable of operating submersed in liquid.
The seven platter design is lighter than standard five platter 3.5-inch drives and no, helium has nothing to do with it. It has the highest data density of any 3.5-inch drive and the lowest power consumption per TB of storage. It also generates less heat than a standard five-platter drive.
HGST is already working with HP, Netflix, Huawei and CERN to certify the drive and give their servers a squeaky voice.