Macbook Pro doesn't read Double layer DVD ?

I have a Macbook Pro 15", about 4-5 years old, and it isn't reading a double layer DVD? Is there anyway of reading this DVD in this machine?
I have even tried reading it through my 1 year old Macbook on that DVD drive which does read DVD DL and it still doesn't work?
How come it doesn't read this Verbatim DVD-DL but when you install software from elsewhere it does read the DVD's, which are also DL are they not?

Okay. Well my Macbook Pro allows other DVD's to be viewed in the drive, and the DL DVD that has the media on it works on the Macbook but not the Pro. And of course the Macbook Pro doesn't write to DL, it is only supposed to read DL, so the media was burnt on the Macbook and not the Pro, so I don't think it is the DVD or the drive.
Therefore I am a little bit lost. If anyone else has any other clues I would be greatful, I will clean the drive in the meantime.
Thanks, Ian

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