It was not a hardware issue. The owner was using INCD (or other packet writing software) and their version did not work with this new drive. Fix? Install the retail version of Nero.
Of course the software product name can differ.
I have recently installed a new DVD RW (LG) 18x on a system which was already having a dvd combo.(Master-Slave)
Now when I access a drive with cds inserted in both dvd I can be able to read the dvd put in dvd combo.but when insert a single cd in each i can read the same.
so what should be the reason?