Also Gyugyu might be a reference to the Hungarian movie: "The Fifth Seal"
"Just imagine you are about to die, but you will be reincarnated in to one of two people; a slave or the rich master. The slave suffers under the master. He has his tongue and an eye removed and his wife and child are killed. He goes on living knowing he is a good person, as he never committed such appalling, sadistic acts on another like his master has done. The rich master has no moral qualms about it at all. He doesn't think what he did was wrong; the slave needed to be punished. You have the choice, whether to be a poor and righteous slave or be a rich and corrupt master."
> The DISC indicator wraps HDD access done via Sys_FileRead. ... The code for this indicator is in SCR_DrawRam.
I can't find the image itself but just judging by its name SCR_DrawRam is for displaying the image for the RAM indicator.