I know things have changed when it comes to storage, but back in the late 90s I worked for EMC the company that manufactured Coca Cola sized machine hard drive storage units. These large devices were mostly used by banks, stock exchanges and other large businesses that need umpteen terabytes of hard drive storage space. Part of my job with a team while building the units involved testing the hard drives some of the devices held 270 separate hard drives. We’d test them in heated chambers of 110 degrees F, in refrigerated chambers at 40 degrees and also at room temperature. On any given day many hard drives would fail, but that was the point to fail any weak links. Management wanted to be sure once the product was delivered that any further failure rate would be very low.

I haven’t the vaguest idea what they are installing in the units today but I’m sure they must be SSDs.