Sony DW-D56A

Just bought a new Dell laptop, did not do much to the burner yet.

I installed Nero-6 ( and the DVD burner is indeed Sony DW-D56A. From Nero InfoTool, the firmware verison is PDS7. Another thing I noticed was it did not read or write DVD-R DL. Is this normal?

Should I upgrade the firmware? I have to buy some blank DVD, any particular brand I shoud get?