nooob here....but aint SSD drives basically "memory chips"...which work better when colder?
I've written about this in the past.
To put it simply, cold temperatures make read/writing to the NAND cells slightly slower and cause less bit errors but induce more wear. Hot temps makes read/writing faster, less wear on the cells but more error-prone.
Pro tip: If you don't want to waste too much time or battery, pull out the caddy and warm it up between your hands or stick it down your pants or whatever. It's actually quicker than letting the heater do the job when it's really cold.