Getting a SCSI search program to recognise the device exists is one thing. Asking AmigaOS to treat it as a useable drive is another. Have you tried renaming the icon of the device driver? AND/OR... Get icon info and change the Device ID in the tooltypes section to whatever the SCSI ID is...
Save of course and then double click the CDx: and your CD drive will spin up, looking for contents! Only Amiga makes this difficult :-) lol
