Sony DVD+/-R

Does anyone know who produces the sony DVD +/-R? Or if that produce them by themselves, What is the quality? Thanks

Wrong forum section, but anyway… Sony Made In Japan +/-R are TY or Sony themselves. Sony Made In Taiwan +R 4X is RicohJPNR01. Sony -R 4X/8X made in Taiwan are probably Benq/Daxon, and come up as Sony 04D1 and 08D1 respectively. All are quite good, no worries.