Advantech ASMB-820I User Manual page 43

 Serial-ATA Controller 1
Set to [AHCI Mode] to have the SATA hard disk drives use the AHCI (Advanced
Host Controller Interface). The AHCI allows the onboard storage driver to
enable advanced Serial ATA features that increases storage performance on
random workloads by allowing the drive to internally optimize the order of com-
mands.
 RAID Mode
Set to [RAID Mode] to create a RAID configuration from the SATA hard disk drives.
33 ASMB-820I User Manual