Hey there, I have attempted 3 times to create a backup copy of my computer's OS X install disc and every time, the burn fails at the verification stage. I tried once with Toast, once with Disk Utility at 4X and once at 2X (the minimum speed my drive will go). Is it normal for the MBP to fail to verify a dual layer disc? I'm using some rather expensive TDK media that I've never had a problem with on my PC's dual layer burner. It's just frustrating that the Superdrive cannot seem to work this one out. I've wasted 3 dual-layer discs so far and was hoping someone would be able to give me a bit of guidance. Thanks!