Why are there 1TB micro SD cards that are the size fingernail and most 1TB hard drives are bigger than my hand?
In: Technology
Different technologies.
The former uses [flash memory](https://en.wikipedia.org/wiki/Flash_memory) which is implemented with transistors which are really small. The latter uses [physical disks](https://en.wikipedia.org/wiki/Magnetic_storage) which also need some sort of motor to spin them and a reader/writer arm.
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