Can someone simply explain the difference between these? Specifically, I am interested in buying a new DVD player (Yamaha 520) but it seems that it is DVD-R and DVD-RW compatible but not DVD+R. This may be an issue as ultimately I may want to make my own DVDs on PC from Mini DV. At the moment I just make VCDs as I don't have a DVD writer yet. Do the formats relate to the difference between burning on PC vs using DVD writers that attach to home cinema gear?