He didnÂ´t mean the DVD media type (-R, +R …) - RitekG05 are alway DVD-R! He ment the name of the disc itself (for example Datawrite Optima Blue, Ridata, Traxdata …). Some are produced very bad or are B-Grade Riteks instead of A-Grade! So the fact is: Some Riteks are better than other Riteks! And, of course, it depends what burner you have. My 3540A doesnÂ´t like the Datawrite Riteks, my LG writes them better (but also not very good).
About the speed: Try for yourself if 8x is better for your discs! But I donÂ´t think so! I burnt a big amount of datawrite riteks with the 3540a drive. With 4x itÂ´s horrible, with 8x itÂ´s even worst! You can see some of my scans here: