Your IDE drives will be placed infront of SATA drives, no matter how you set the boot drive preferences Most BIOSes will detect PATA first over SATA, however you are wrong with your statement and you can choose in most BIOSes where to boot from, it doesn’t mater if it PATA, SATA or even USB-HDD. which is exactly what i thought. my bios is prolly one of the best thats out there and has so many options, maybe other bioses just dont have the option.