If you have Microstudio, try importing the individual tracks. Then using Custom Assembly, write them to a new CDR disc.
Try importing them into Hoster.
I don't recall ever hearing something like this where it was not a bad disc. For example, SC use such cheap CDR media that we have heard it take up to 25 minutes (yes... twenty-five
) to import a SINGLE TRACK. If the disc was copied to MTU Silver CDR media, it imported at normal speeds.