Check with a texteditor if CD0 has the correct device and unit number (uaescsi.device unit 0). If that's the case you can try to start the CDFS prefs program, and see if CD0 is present and click save or use.
Edit:
See
here for a possible explanation. This problem occurred in af2005 though and occurred when using more than 1 CD drive.
Certain combinations of more than one CD-ROM drive (e.g. CD0 on the SCSI bus and CD1 on the IDE bus) are not detected automatically in the default configuration. This may be solved by selecting the drive in the CacheCDFS Preferences, which appears to trigger something which makes the drive be seen. It may be necessary to move CD0 and/or CD1 from Storage/DOSDrivers to Devs/DOSDrivers first.
