most dvd burners are + and -. what you need to do is check witch dvd's your player plays. my players for example play
dvd-r
my players (except my pc dvd player) are older and do not play -rw or +rw disks.
dvd-r is the industry standard but its the same issue as with vhs vs. betamax. soney players use dvd+r disks and some sony players wont play a burnt disk unless it is a +r.
just look into whitch dvd's your player plays.
p.s. most dvd burners will burn dvd-r, dvd+r, dvd-rw, and dvd+rw. my tdk can burn all of those and only ran around $150.00