SSD because it’s still a virtual block device which drives all over its 1D blockspace to keep cache full of what it more and more knows you want next. Plus, SSD covers MLF (flash, surely rendered in ROW as multi-instance-level-flash,) phase-change, magnetic and spin tech until the market can make nicer stabs at distinction. Perhaps as MicroNokia 44mpixel images (1in. sensor…) top out the storage bag quicker and will incite a bit.