I downloaded the Linux Mint 12 Gnome amd64 image from one of the primary mirrors in the US. I then verified the sha256 sum. I burned the image with Brasero, and it reported that the burning was successful. A visual inspection reveals no noticeable smudges or scratches (it was a new disc that I had just removed from the package). This is the same procedure I used to burn version 11, which boots successfully.
When I get to the boot menu, I select the option to verify the disc contents, and this error message appears
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Loading isolinux: Disk error 20, AX = 426A, drive EF
This is the same error I get when I select the default boot option. I haven't yet tried compatibility mode, but I suspect it will be the same.
I tried booting the DVD in another computer. This time the error message was
It seems very strange that the DVD gives two different error messages on two different machines.
I saw this thread: http://forums.linuxmint.com/viewtopic.p ... 62&start=0
but no clear cause was determined. One post suggests burning with a different application, but I don't see how that would matter, and I have no reason to believe that re-burning the DVD will give different results.