Maybe this is where we'll have L1 disk storage and L2 disk storage and L3 disk storage access.
Explainer? Look up how L1, L2 and L3 CPU CACHE systems work on CPUs today. Maybe not everything needs to be on now costly SSD?
Excellent article on the future of the SSDs.
Hard disk manufacturer Seagate has published an extraordinary report all but proving that solid-state disk (SSD) technology will remain niche for the next decade or two, at least.