I have the internal dvd640i, I downloaded there firmware update as well as there print driver update.... I did get an email back from HP, I think it makes some sense: Thank you for contacting HP Optical Drive support.
Besides the firmware upgradem we have an available LS engine on the
please download and install it :
In addition, as the The difference in appearance of labeled LightScribe
and CDs stems from the difference in how CDs and DVDs are made in
DVDs have a second plastic layer, which CDs don¡¯t have, that creates a
¡°plastic sandwich¡± around the reflective layer on which data is
additional plastic layer separates the reflective layer from the
coating on the surface of the disc. When you look at a labeled
DVD, you are seeing through that additional plastic layer, which
three-dimensional effect. In our testing, we have found that many
the dynamic appearance of LightScribe-labeled DVDs is especially suited
media which store videos and creative content.
Any additional questions, please do not hesitate to let me know.
Have a nice day~