This Sony drive will not recognise 1-4X DRV+RW media, but will work with media branded as 1-2.4X ok. It appears that the firmware in this drive needs updating to include the newer media.
Unfortunately this is an OEM drive and Sony don't even officially recognise its existence. I believe that HP is aware of the problem and we can only hope that a firmware fix is forthcoming as 1-2.4X speed +RW media is becoming increasingly harder to find. If you look on Sony's web site you will see a firmware update to fix this same problem for the DW-U50A which is fitted to Sony's own notebooks. I would suggest that you pester HP Tech Support until a fix is forthcoming I know that I will.