Ah! You beat me to it.
You can also look for the media ID inside of most versions of Toast.
Unfortunately, I'm Mac-less these days, so I can't take a screen shot of exactly
what you need to look for. (Know anybody that has one cheap, or wants to make a donation to our cause?)
It was recently mentioned on another site that...
you can simply find the media ID by
- putting the disc in your drive,
- going to System Profiler,
- then to Disc Burning.
If a disc is in the drive, it will display the supported burning speeds, types of discs supported, as well as the media ID of the disc that is currently in the drive.
Maybe that will help, too!