burned super mario galaxy ntsc on a different burner (my desktop nec instead of my laptop matshita), and it didn't work. i used phillips dvd+r, but i realized the problem was that the burner had set the disc type to dvd+r instead of dvd-rom, which can't be read by the dvd hack, so I got error -4100. i checked and saw that i have other burned phillips dvd+r that have the book type set to dvd-rom, so the problem was the burner. i shouldn't have changed, it didn't occur to me at the time, and i think there is no way to change the book type on a burned disc unless it's a rewritable and you erase it. the session was finalized anyway, so what's done is done.
tried to use nero disc speed to change disc booktype and drive booktype, but the only option it gave me was to change the dvd+r dl booktype to dvd-rom. i do wonder if the hacked firmware i installed to this drive to allow it rip dvds at full speed has caused this, but i doubt it.