I plan to install OS on the Adaptec ASC-19160 in your X5DA8 board and then use the onboard U320 SCSI for video editing storage, but when system boots up it does not show the Adaptec ASC-19160 BIOS.
Please enter the onboard SCSI BIOS by pressing Ctrl+A and change the SCSI Controller Int 13 Support to "Disable--NOT Scan" for both channels.