Big 20: Hard Drives
Twenty years ago you could pay a thousand dollars for 100 MB of memory that would fit in a shoebox. Today you could pay a hundred dollars for a terabyte that would fit in a deck of cards. Despite this, magnetic disk storage is still vulnerable to physical and electrical shocks. They still wear out like any mechanical device. They still have a place in large cloud server networks because of their low cost and reliability.
Flash drives are killing hard drives in mobile devices like phone and laptops.
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