Some of the -R's are made in Japan TDK G02 discs (in a taller cakebox, made to hold 50), and some are in a smaller cakebox, and are made in Taiwan. Not sure whos those are, didn't bother with them when I could get the G02's.
The +R's all appear to be Made in Taiwan, and the package I bought had "RICOHJPNR" as the manufacturer.
Well maybe I should get a pack of each. It would be nice to finally get a quad burn out of the 500. I prefer the - becuase it is more compatible with older players.