With which gas hard drives can be filled to boost storage capacity by 50%?

The Ultrastar He6's50% boost in capacity is impressive, what's most notable is the power reduction, Zhang said, because the high-capacity drives will be used in large data centers and cloud infrastructures.

At one-seventh the density of air, helium produces less drag on the moving components of a drive - the spinning disk platters and actuator arms -- which translates into less friction and lower operating temperatures.

The helium-drives run at four to five degrees cooler than today's7200rpm drives, HGST stated.

Sealing air out of the drive also keeps humidity and other contaminates from getting in.

Netflix, which uses HGST high-capacity hard drives in its data centers, said the increase in capacity and lower power-usage in the Ultrastar He6 hard drives will go a long ways toward optimizing their streaming video server infrastructure.

Netflix serves up billions of hours of streaming video per quarter to over40 million subscribers requires a constant effort to optimize server infrastructure, according to David Fullagar, director of Content Delivery Architecture at Netflix.

HGST (a subsidiary of Western Digital) have revealed a new type of storage medium, the world’s first “hermetically sealed, helium hard drive”. By replacing the air in a hard drive with helium (a gas that is seven times less dense than air) the disks inside create less turbulence when they spin, meaning more discs can be packed into less space and use less power.

In numbers the new six terabyte hard drives are23 per cent more power efficient and offer50 per cent more capacity than regular drives. It's an innovation that tackles a purely mechanical problem (the limit of how fast disks can spin when packed closer together) to create a high-tech improvement.

Not only is HGST’s “Ultrastar He6” the first helium-filled drive, but it’s also the first to fit six terabytes of storage into the standard3.5-inch hard drive container.

Storage companies have been experimenting with helium for decades but creating a manufacturing process that produces long-time airtight hard drives has proved elusive until now.

And although this sort of technology might be slightly beyond the ken of the average consumer at least for now) the ability for large data centers to fit more storage into less space using less power has all sorts of escalating benefits.

HGST president Mike Cordano told AllThingsD that one of the main markets for the new drives will be cold storage – ie, data that is rarely accessed but still needs to be available at any time.

This could include data like old photos on Facebook - you stick them online, never touch them again and look at them rarely, but you still want to access them whenever you like. Previously this sort of data would have been stored on magnetic tape, but this is no longer practical for the internet age.

As well as cold storage, there’s one extra kicker in favour of the helium-filled drive. Because they’re hermetically sealed it also means the drives are watertight, meaning they’re perfect for use in what are known as “immersion data centers”.

In these systems hard drives and servers are submerged in a non-conducting fluid similar to mineral oil. This means the hardware can be run at relatively higher temperatures, but remain cool thanks to the liquid. In more ways than one, this technology is anything but a lot of hot air.