A1200 IDE CD-ROM problems

[alx]

I've got an A1200 with a CD-ROM externally, connected via a PCB with 4 IDE connectors on it.  The A1200 has IDEfix97 on it.  Unfortunately, the only discs that it will recognise are DPaintV (the only "Amiga" disc I've got, despite the fact I thought all CD-ROMs were standard) and CD-Audio discs.  Any ideas?

[alx]

I've now got it to read CD-Rs that are burned with none of the extra options (ie joliet).

Run Workbench:Prefs/CDFSprefs then adjust the settings in the gui.

What settings?  None of them seem obvious :-?