CDO: is defined from the AsimCDFS Prefs and uses the CD0: from the storage drawer for DOSDrivers. There should be no CD0: in your conventional DEVS:DosDrivers drawer. Further the disk.info obviously needs to be on the CD. I am looking at a CD for Amiga software at this moment on my 4000 with AsimCDFS under 3.9 and the icon appears on the screen and the disk.info is on the CD. Obviously without that it would call up the standard OS3.9 disk image. I ran SnoopDOS just to see what was happening and the ENV drawer in RAM shows everything but the disk.info is called from the CD0: in the AsimCDFS prefs.
Hope that makes sense. The diskchanger fires up on the head of the screen but by that time the CD is already mounted with the image from the disk on the screen. Generally I have the CD in the drive at boot anyway.
Not sure about patches. Mine just works. I use the AsimCDFS disk changer. Not sure how that differs from your Pioneer.
