The dvd were bought form svp aka
www.blankdiscshop.co.uk
They are Infosmart Unbranded White Top (4x) DVD-R.
I checked in the threads here previously where someone ripped the media codes from the 1008 firmware and AN31 was supported though from previous posts by Marco-BTC AN(30,31,32,etc) or anonymous media can be of varying to poor quality.
What I wanted to know was what could be the cause of the missing data lines, are you saying that bad media can cause the burner to completely refuse to burn at times?