From the article:<p>&quot;An obvious question is why are we talking about spinning disks at all, rather than SSDs, which have higher IOPS and are the “future” of storage.&quot;<p>&quot;The root reason is that the cost per GB remains too high, and more importantly that the growth rates in capacity&#x2F;$ between disks and SSDs are relatively close (at least for SSDs that have sufficient numbers of program-­erase cycles to use in data centers), so that cost will not change enough in the coming decade.&quot;