These are multi-session disks. Sound Coice, Chartbuster, Top Tunes, and probably others are now using this.
There are 2 ways to deal with these.
1) you can archive your disk with microstudio. When you get to track fifteen (or the last music track) and microstudio hangs, eject the disk, microstudio will show an error but you find that it did import track.
2) you can import that one problem track with microstudio as explained above and then import into Hoster as a HD track (3.008 or 3.110) .
Hoster 3.120 which is tentatively due out the end of this month will import multisession directly.
Sam