I'm currently using DVD Cloner 8 program and have an HL-DT-ST DVDRAM GSA-4084N. I've been backing up my DVD's with a DVD+R 4.7GB which has presented no problems. Well, when the DVD is larger than 4.7GB, DVD Cloner 8 suggest that I switch from DVD-5 to DVD-9. When that's the case, I use DVD+R DL 8.5 GB. Once the back-up is complete, the DVD will not play in any DVD player. Though it does play on my hard drive. I'm confused.