To analyze the partially-burned coaster you're holding in your hand,
you could use the free Nero CD-DVD Speed. I have version 4.7.7.13 on my
desktop and this is version 4.7.7.16. As far as I know, this is written
by Eric Deppe, and was also distributed from his web site.
http://www.afterdawn.com/software/cd_dvd/dvd_tools/nero_cd_speed.cfm
There was a name change for the tool at some point. It's called
Nero DiscSpeed now.
http://www.majorgeeks.com/download118.html
Another name that comes to mind is KProbe, but it is supposed to be limited
to Liteon burners. I used some version of that years ago. Some media
burning experts, burn with one drive, and they keep a second (known good)
drive just for scanning and rating burn quality.
There are various symptoms of "bad burn". I'm not an expert on diagnosing
these. Sometimes, when you buy a new burner, you really need to update the
firmware on the drive, before dialing it in and testing what media works.
I've only owned one burner, were it couldn't burn worth a damn until
I did a firmware upgrade, and that added more media tags to it. My latest
two LG drives "just work".
http://img402.imageshack.us/img402/6750/necdvdrwnd3540a1w906sepyk6.png
If you look for a review of your optical burner on the net, sometimes
that will give you some idea whether bad burns are endemic.
*******
You can try another burning tool, but if it's a drive/media issue, no
burner program can possibly fix that for you. I've used this tool on
my older OSes, with good results. Before wasting any more media, I'd
scan first, and if the scan looks good, then install another burning
tool for a test. If the scan looks bad, check for a firmware update,
install new burner program, and test.
http://en.wikipedia.org/wiki/Imgburn
When drives cost $20 for a desktop drive, you can easily waste another
$20 on small packages of media, testing for compatibility. Done right,
it can take the better part of a week, before your new burner is operating
sweetly, and you know what brand to buy a spindle of.
Paul