In the long run anything that moves in DC is way less reliable than systems without moving parts. On the top of that, these systems also need more energy to maintain the movement. If you increase the size than you need better materials to keep up with the increased mechanical load. I bet by 2020 we are going to have better ways of storing large amount of data than a spinning disk. The new optical drive would be a good candidate for some use cases, mostly for archiving though:<p><a href="http:&#x2F;&#x2F;www.sciencealert.com&#x2F;this-new-5d-data-storage-disc-can-store-360tb-of-data-for-14-billion-years" rel="nofollow">http:&#x2F;&#x2F;www.sciencealert.com&#x2F;this-new-5d-data-storage-disc-ca...</a><p>For continuous read&#x2F;write workloads SSDs are the best for many reasons (energy efficiency, latency, IO bandwidth) and I think the world is moving that direction to replace spinning disks with these. I am hoping to see a bump in the SSD capacity as well. We are here now:<p><a href="http:&#x2F;&#x2F;www.extremetech.com&#x2F;computing&#x2F;221303-the-worlds-biggest-ssd-has-arrived-at-13tb" rel="nofollow">http:&#x2F;&#x2F;www.extremetech.com&#x2F;computing&#x2F;221303-the-worlds-bigge...</a>