There is NO STANDARD in this area so I share my fix for the last one I corrected. I moved the IDE drive to the secondary IDE and in the BIOS found an option for it to set the SATA to emulate the primary IDE channels.

Remember this is an area that is not standardized so keep at it.
As you didn't supply make, model and a link to the product manual I can't see if there was an instruction in the manual.