LH-20a1p wont recognize double layer (Lite-On LH-20A1P)

[qanda]This thread is about the Lite-On LH-20A1P. Click here to see full specs[/qanda]Its drivin me to drink… burns dvd+/-R no problem, cds no problem but when I insert any + or -R DL disk it wont see it. Firmware is KLOP and I am using nero9 in a windoooooze XP Pro machine. Media is ridata.

Thanks in advance

Try better media, verbatim for instance.