Each BIOS 'SATA RAID/AHCI' mode comes with at least 3 different mode - Disable/IDE or RAID or AHCI.
Does setting the 'SATA RAID/AHCI' mode to 'RAID' will cause the following:
RAID 1 activated when 2 hard drives is inside the desktop machine.
RAID 3 activated when 3 hard drives is inside the desktop machine.
or the RAID mode will remain as JBOD (Just a Bunch of Disks - each drive functions independently of one another and no redundancy is supported)
(Suppose that the hard disks were of the same size.)