I'm running Leopard (10.5.7) and I'm currently at a 100% fail rate anytime I try to burn to dual layered DVD+R DL media. It fails under both Toast and Disc Utility. I have an internal (Not So) Superdrive (HL-DT-ST DVDRW GSA-S10N) and an external Sony DVD drive. Both drives fail around 50%. I've tried to different brands of media and I'm getting the exact same result (Memorex (cheap, I know) and That's (Taiyo Yuden from Japan). I'm also averaging a 50% burn rate with regular DVDs and a 100% burn rate with regular CDs in iTunes. Anyone have a problem, or have heard of a problem like this and how to fix it. I'm seriously leaning towards dropping back down to Tiger and seeing if it works on that. edit Never mind about installing Tiger, can't install Tiger on this computer (won't boot off of the tiger install DVD). Great, looks like I'm stuck with a computer that won't burn DVD DL media. What's the point?