And as in 1978, they are more expensive than moving-head disks. Even after you count the cost of the slowness and the engineering to avoid the seeks.
That's on average, of course. Solid state storage gets used more and more every year as more applications fall out of the disk-costs-less category.
I think one of the great pastimes in the computer industry these days is guessing when more than half of storage will be solid state. While non-professionals have been saying "a couple of years" for about 20 years, I'm now beginning to hear 5 years, for new storage, from credible professionals.
I know some day the use of moving parts in a computer will be a subject of ridicule. It already seems perverse.
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