When recording an image, k3b has option 'verify recorded data' (or something similar, I don't have english version). It will calculate md5sum of burned dvd and compare it to the original md5 of iso image calculated before recording.

Ok, I tried checking my DVD with the following command:

dd if=/dev/dvdrecorder bs=2048 count=169383 | md5sum

Are the numbers there correct? I'm not sure what numbers I should be using for the openSUSE iso.

Thanks.