When to burn +r and -r?

I have a sony dru500ax dvd writer, I try to backup a movie using a -r disc with Nero software. After the burn process, I try out the disc but it didn’t work.

Do I need to burn with a +r disc or do it need another software to do that?

Please help.

Thank you

On what device did you try the DVD-R disc on? The problem could be just that the device (DVD player) can’t read DVD-R format disc. Burn another copy of the movie w/ DVD+R using Nero and try again. Nero + DVD+R works for me on both stand alone Sony and PS2.