Try you burner and make sure that it works. Next, I would recommend that you upgrade to firmware 218btrpc1. Use NECWinFlash to backup your old firmware before you update to 2.18. Taiyo Yuden000 T02 8X DVD+R would be a good choice. Make sure you set the booktype in NECWinFlash to DVD-ROM for DVD+R media.
218btrpc1 is a mod firmware. Faster read speed with Dual Layer media and bitsetting option.