Bummer. Googling your error codes brought up a couple of possibly useful threads:
http://boards.support.roxio.com/roxi...ssage.id=19702
http://forums.macrumors.com/archive/...p/t-89276.html
http://club.cdfreaks.com/showthread.php?t=131713
FWIW, I have the same drive as you in my eMac and a while back it just stopped offering 8x as a burn speed. In semi-desperation I flashed the firmware to 1.18 which also enabled DVD+R burning and it's been as good as gold ever since.
If you want to try that, this thread has all the info but you'll need to sift through to find it:
http://forum.rpc1.org/viewtopic.php?t=30233
Hope something works for you.
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