You can solve this problem by disabling the sudden motion sensor on your laptop. When the disk is going from layer 1 to layer 2, the sudden motion sensor activates which then disrupts the burn process. So if you want to burn a dual layer disc, disable the sensor.. But there is a risk! If you drop you’re Mac book, the superdrive will be damaged. Your bes option would be to disable your sensor.. Burn your disc and then finally enable the sensor again.

to disable sudden motion sensor start Terminal and type:

$ sudo pmset -a sms 0

to reactivate type:

$ sudo pmset -a sms 1

Another thing I found was always try to use Verbatim, all the other brands didn’t work out.