When booting the live DVD, at the boot prompt, I ran

knoppix testcd

The test was taking ages so I went away from the computer. When I came back
(about 25 minutes later), the computer had completely booted, and there was no
message about the testcd results.

Are the results stored somewhere, so that I can look at them, or does the fact
that the computer booted mean that the DVD was found to be fine?