It was only later, when upon the white flash of another high sea hurling itself amidships, Jukes had a vision of two pairs of davits leaping black and empty out of the solid blackness, with one overhauled fall flying and an iron-bound block capering in the air, that he became aware of what had happened within about three yards of his back.
Apple introduced its version, called Fusion Drive, that tiers storage on flash memory or a HDD depending upon frequency of use, but appearing to the user as a single storage device.