The first item “CD-ROM” is for SATA1 or SATA3/5/6 port (provided by ICH8, black SATA connector) if you install SATA CD-ROM in one of SATA1/3/5/6 port. While you install SATA CD-ROM in SATA7 (red SATA connector) or PATA CD-ROM in IDEJ1 port (supported by JMicron JMB361), please select “CD-ROM model” from the options of “First Boot Device” of “Advanced BIOS Features”. For exp, If you install one AXX DVD-RW in SATA7 port, please choose AXX DVD-RW from the list of “First Boot Device” to boot from it. If you insert AXX DVD-RW into SATA1 port, please select “CD-ROM” from the options of “First Boot Device” to boot from it.