Non volatile memory has been available for a long time, Arthur, at least for the non-price-constrained consumer. I remember, vaguely, that I used to be a technical specialist in the area of storage (actually a manager, but also a Principal Engineer), and this doesn't surprise me in the slightest. It would be great if everything was solid state, but disks are going to be cheaper and bigger for the foreseeable future. Maybe quantum storage will eventually take over, but that's dreaming.