It seems you have to update the firmware on your burner according to this piece of information...
This might not apply to you but it seems a common problem according to google search
Unknown error occurred (2131) - Google Search=

Quote: Originally Posted by
Kathey
I recently bought a new Toshiba Windows Vista laptop, other than my current
issue I love it! I downloaded Itunes this morning, imported music from my
ipod...all went well. However, when I went to burn a CD, I received this
error message, "Attempt to burn disk failed, Unknown error occurred (2131),
then my CD popped out. I have burned CD's in the past on other computers,
using Itunes! I've been messing around all morning trying to find a solution
and am at my wits end. It's probably something stupid that I'm over-looking,
at least I hope so. Can someone please help me?
--
Thanks, Kathey