I saw in the specs of iMac G5 rev A, that only DVD-R is supported. However, I have burned DVD+R discs without any problems. I´m now going to buy a large quantity of DVDs and the price of +R and-R is the same. I wonder if it is safe to buy the +R and would it be better than the -R? And does the quality of the DVDs differ between manufacturers or is it just standard? I don´t know much about DVDs but some people argue that +R is better in some way.