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@Well_is_it
The main factor in durability comes down the the controller in the drive itself, which are more optimised for constant use in an ssd whereas an SD card has a very different usage pattern, usually.
SSDs also tend to use different types of flash storage, SLC and MLC depending on who's making them and for what price.
The gist is that SSDs employ a lot of circuitry to manage their wear so its as close to their theoretical maximum read/write cycle.