Videos For December 1 and 3

I am having some surgery on December 2, and will not be available to lecture on December 1 and 3. So here are some video lectures to fill the gap.

There are three videos with total running time 2:40:01, which you can divide into two parts any way you want. (And pick whatever 0:10:01 you want to ignore.)

Solid-state drive technology, which is implemented with flash memory.
This one is from 2020, complete with a stupid face shield.
Just that.