Try this. Worked for me.
Props to danny.merrill (4 posts above this one) for the fantastic idea
of trying a lens cleaner disc.
I've browsed the web and read several forums on this topic. I avoided
this problem as much as possible because I don't burn DVDs terribly
often. I could afford to try out many things, one at a time,
over an extended period of time. I have sacrificed a couple dozen
DVDs in the process, just like many others.
My problem is similar to eveyone else's except that I can easily burn
audio CDs in iTunes, yet I am unable to burn DVDs in Disk Utility or
Toast.
These things have NOT worked for me so far:
- reducing burn speed for DVDs
- saving as images first, then burning DVDs
- deleting the com.apple.finder.plist file
- resetting PRAM and NVRAM (worked only for 1 or two DVDs)
- chaning disc brands (``no-name,'' memorex, verbatim, sony...I
thought it worked at first, but only was successful with a few DVDs from
Sony...then I ran into the same problems)
- closing all other programs except Toast/Disc Utility to
conserve memory
The ONLY thing that has worked for me thus far:
- cleaning the lens with a CD lens cleaner
Therefore, I recommend that you spend a few dollars to buy one of these
"special" CDs with a soft little brush that cleans off the lens. I
have burned several different DVDs and CDs over the past few days
successfully.
HTH.
Please reply to let others know if this works for you!