Re: So, can Kryder's Law in fact carry on?
"There has been no iron oxide in hard disks for over a decade at a minimum. "
It's a metaphor. Language is based on the use of metaphors to represent new things by overloading the meaning of old words. The word "computer" was originally used for people who did calculations.
A "screen" was a relatively 2D construction used to hide things - possibly with decorative painting. It would seem that "picture", "painting", or "canvas" would have been more apposite words to borrow as names for our electronic devices. The inheritance was probably via the usage for the larger cinema screen.