hm.. thats pretty interesting.. are these silver cd's like home made, or like bootlegged one's? do they have a logo or any kind of artwork on the disc? you could try burning a disc and seeing if the playstation can read it thru the cd player. one more thing you can try, is buying music
cd-r's.. they say its only for music purposes, but its really not.. they are just made so they can be read by most/all cd players.. they will work for data purposes too.. do your cd-r copies work in your friends playstation?

let me know. this is pretty interesting.