Error Code 8002006E trying to burn DVD

Question

I am trying to back up data, have done this MANY TIMES before with same computer, same OS, same software, same DVD disk/media which I have been using for several weeks/months - no problems until today. {Toast will not burn either}
I do not know what to do next, no info in knowledge base about this.
I checked the Applications>Utilities>Console, which says, "Unable to launch application in response to digihubevent" for both attempts (Apple and Toast) whatever the * that means.
THX

Answer 1

Here I am, over 2 months later! To update, this is what I have done, to no avail.
I started getting a new error message recently, so reposted under that, oops, too many posts. I forgot I had this one going but like to "clean up" my questions with results.
But no good result yet. I fear it must be the drive...
For your information, on reading a lot of posts, this is what I have tried, so if you are having the problem, go down the list. #3 is not in much detail, I know, but it seemed not very likely to work although one person had gotten it to work for them, everyone else was skeptical:
1) I burn at the SLOWEST speed possible, which helped me last winter when this all gradually started to happen.
2) I eliminated the Preferences>com.apple.finder.plist
3) I did the whole, take the battery out, hold down power key +5 keys thing, bong bong
4) I blew air from an air compressor into the slot to clean it out
5) I tried burning through disk utility.
6) Got a disk cleaner, Maxell brand CD_R Disk Cleaner disk, and cleaned the drive.
7) I ran out of Maxell and HP disks, and am using Verbatim disks
8) everything flat. do not jiggle computer. have rebooted etc. no programs running.
I can burn successfully through firewire to my external burner.
Sounds like this is it, right? DVD burner shot?
HL-DT-ST DVDRW GSA-S10N: