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#100
Things will end up getting smaller over a period of time. Look at the first mainframe computers running tape drives.
As for SSDs becoming the main attraction and seeing mechanical drives phased out entirely don't count the chickens before they hatch! One report explained Seagate's goals for introducing 20tb laptop and up to 60tb desktop drives by 2020 showing they are far from dumping the ATA standards entirely. With tech breakthrough, Seagate promises 60TB drives this decade - Computerworld