i have sony drx500ul.....am using recordnow max 4.5......and optodisc blue color 80 cents from supermedia. almost all disc are failing.....some work most dont.....invalid field in cdb.....always at a different sector....sometimes goes for minutes and sometime more than 20 minutes. have tried sony updates 10e 10f 10g 20e. all cables are sucure. i think in nero both times i got an error that after reading the log said media error.....do i just have some bad discs? can someone please help before i surrender. thanks.