It's a DVD+R and i burnt it using software on my computer. It plays fine in my computer but says unknown disk when i played it in 2 different DVD players. I have used DVD+Rs in the dvd player before and they haven't been a problem this is the first one i have made myself though and dont know why it won't work since i followed all instructions. This was tried after an attempt at dvd+rw. When it gave me an option to burn as a USB or CD/DVD i chose the later.