What am I missing? I have tried to burn a DVD+R DL disc on 3 different iMacs and one MBP. I have tried Maxell, Sony, Verbatim, Mitsubishi and no-namers. NOTHING has worked so far. I consistently get the error that the laser couldn't be calibrated for the media. All of the optical drives were MatSHITa and all were listed as being able to burn DVD+R DL. So, is there something I need to do before I try to burn DL discs? Is there a preference that needs to be set? This is getting expensive. Are these optical drives that Apple is using really that bad?!? Wow, I hope not. Thanks for any suggestions.