I'm using the latest (105) firmware - I received this reply from LG:-
Thank you for your email. Please find a list of the following recommended media: CD-R - LG, Mitsubishi Chemical, Verbatim, Taiyo Yuden, TDK or SKC CD-RW - LG, Ricoh, Mitsubishi Chemical, Verbatim DVD-R - Fujifilm, Maxell, TDK DVD-RW - JVC, Mitsubishi Chemical, TDK DVD+R - Taiyo Yuden, Maxell DVD+RW - TDK, Fujifilm DVD RAM - Maxell, Panasonic Philips is not one of the recomended media types. Also you may need a firmware update. Yours sincerely LG Electronics UK Helpdesk
To which I replied...
I have the latest firmware installed and you know what...? There is NOTHING wrong with the media, there was a bug in the firmware which meant that it was applying the wrong write strategy to these disks - the media ID R20-000 SHOULD have prompted the drive to burn at 2.4-4x and 6-8x, however, the drive would onbly allow 4x.
I edited the write strategy in the firmware to allow ALL SPEEDS for R20-000 disks and they not only burn perfectly at 8x (as they should) but they also give great results at 12x and 16x.
While I like this drive, I'm fed up with you and other manufacturers playing your PETTY little corporate political games like favouring certain media manufacturers - this is now the 5th revision of the firmware and as far as I can tell, this error exists in EVERY VERSION along with MANY other errors which cripple the drive when presented with non 'recommended' media.
I believe that there is a strong case for investigation here under european trade laws and I will be raising this matter with relevant bodies.
While I like this drive, I'm personally fed up with the games that these manufacturers are playing - of course there are poor quality media out there, but this is obviously an error in the firmware, (the R20-000 is listed in the write strategy of firmware 105 - however, the drive does not apply it). At the end of the day, companies like LG have made deals worth millions with major manufacturers, things are just as bad within the 'DVD Forum' as well - consumers like us get shafted, and big companies get awway with blatently under handed and anti-competative strategies every day.
I'm just thankfull to CDFreaks and people out there who write great warez like MCSE, DVD Identifier and hacked firmware!