I have had a look on the bois/coms setting and I have not been able to find any way to disable AHCI or find out how to operate in IDE only.
I have a Gigabyte GA-EG41MF-US2H
anyone know how to do this?
Which BIOS do you have?
Different BIOSes call the same thing by different names. Perhaps there is an entry called "SATA Controller Mode Option" and you can change the setting to "Compatibility."