If you use a -R media the player reads it as a -Rom. Good -R media can be found for $0.30 to $0.35 us. Phase change media - + RW cost more and will cause more problems than it's worth. Some use it to test things and thats ok but if it won't play for you why waste your time and money. My Sony DVP-NS70H plays DVD -R, +R, +R bitsetting changed to -Rom, and +R DL bitsetting changed to -Rom.