So how do external hard drives work?

So I need something with 2TB but I’m only used to SD cards. And I need it to work like an SD card ya know. Something that can hold files and be viewed from any different device that it plugs into, e.g. going from one laptop to another. SDs and USB flash drives seem to be too expensive but external hard drives look... show more So I need something with 2TB but I’m only used to SD cards. And I need it to work like an SD card ya know. Something that can hold files and be viewed from any different device that it plugs into, e.g. going from one laptop to another. SDs and USB flash drives seem to be too expensive but external hard drives look like they’d be ok and cheaper. So do they work like SDs or not?
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