I burn dvd -r and dvd+r and it will not play on it

It is possible that the disks are not finalized. You may need to configure it to auto finalize, which is off by default. It would be impossible to have more than one title on a disk if you always auto finalized. Check your manual, and finalize your disks. Many times marginal disks will play OK in the unit they were recorded on, but not so well in other players. The media (disks) could be the problem as well. On a side note, the DR410 will NOT burn DL (dual layer) disks. I hope this helps and good luck.