Quote - Never did figure out the difference between +/- R DVDs, people always just sais to use

From what I read, these days there's not much practical difference.  All modern hardware handles either just fine AFAIK.

Quote - and even though the burner runs at 18x speed, i would suggest (assuming you find the option) to burn is at lower, say 4x speed, no need to push the limits when you don't know that everything works perfectly below the limits.

Again based on what I read, that's bad advice.  It's counterintuitive, but from what I understand discs rated at higher speeds are best burned at their top speed, and burning at slower speeds actually causes more problems.