I think they are talking HDD vs SSD.

They look like something from Baker era Doctor Who

What do mean regarding terrible names? “Moth” isn’t inherently a bad name; any negative connotations of the word come from the creature itself.

You should check out the BBC guidelines for subtitling. They are really good and include preserving the intent of the program, avoiding ambiguity, and not spoiling jokes with bad timing.

I thought it was a trick by sign writers who charge by the letter.