This may be a stupid question. I have always used +R's until I took advantage of the 4X -R TY sale on meritline. I have been burning movies fine on these, they play on every DVD player I have flawlessly. The weird thing is, when I burn data on these -R's, my DVD-ROM does not recognize the disk. The same DVD-ROM plays movies I burn on these disks however. Are -R's supposed to be used primarily for movies? I tried 3 disks thus far. Just struck me as odd.