I just wanted to know if it could cause problems if I see some discolored rings on the disc after I burnt them?
depends on drive and media, many drives use Z-CLV writing which causes difference in colors and others use OPC technologies that changes the writing power and thus creates differences in the color.
Usually it's normal and nothing to worry about.
I have a Pioneer DVR-108 which I believe uses Z-CLV. And the media I'm using is suppose to be some TYG02, but im pretty sure its fake media because there is no serial # on the hub.
I'll try to get a picture of how it looks on the DVD.