Oh, good point.

First, make sure this isn't simply a "second disk drive not appearing this film" problem.

If both drives are working fine and you can browse their FIDS folders... Something worth trying. Get a directory listing of all of the fids, divided into lists of the *1 files and *0 files. You might need to work with a largefile ASCII editor and/or a spreadsheet program to do this....

Ideally the *1 files should all be very tiny. If you find a huge one, that might be your culprit, examine its contents. The *0 files should be divided into two groups: All the MP3 files and all the playlist contents files. The MP3 files will be large and will be many in number (22,000), the playlist contents files will be relatively small and theoretically few in number. If possible grab all of the *0 playlists contents files and see if they all truly contain playlist content data, or if one of them is somehow corrupted.