Sarami, I was told to post some logs here for you to take a look at.
I have some Karaoke CD-i discs that seem a bit weird. When I select CD-i as system in DICUI, the dump itself seems to go right but an error pops up that EdcEcc.txt and the .scm file are missing (which are indeed missing). When I dump as Audio CD it works fine.
I don't know what kind of disc this is though. DIC detects 15 audio tracks and no data-tracks. However, the manual of the disc shows some kind of track selection screen. And even if it were a pure audio-disc and it would be just some kind of built-in CD-i music player, it still doesn't make sense because the manual shows that there's track information and even some kind of images. I'm not 100% sure whether the images come from the disc though, or whether they are built-in images.
Furthermore, when looking at the disc in IsoBuster, IsoBuster shows 16 tracks total (whereas DIC detects 15). However, track 0 has a red plus icon in front of it which means according to the manual:
This icon can be placed next to a track a session or a file icon.
It means that IsoBuster felt the need to compensate or alter what the drive returned to get to the data.
E.g. CD-i discs are often not correctly recognized by CD/DVD-ROM drives and IsoBuster tries to compensate for that (possibly assumes tracks at certain locations) to be able to give access to the data.
Plus, in IsoBuster track is much larger than the other tracks. Track 0 is about 180MB and the other ones are around 30-40 MB. In DIC however, track 1 (the first track) is about 220 MB; seems to be the data that IsoBuster shows as Track 0 and Track 1 combined.
I'm a noob when it comes to all these disc technicalities though, so the above might be total crap.
Logs of the dump with CD-i as selected system are here: http://a.tmp.ninja/isB7QKpDiEc1.7z