The definitive answer (or at least one!)
I guess you have an ASUS mothrboard with an onboard JBMicron Raid controller. In the bios this can set to disabled, ide, sata etc. If not set to disabled it expects to find some raid discs that you have set up using the the software that came with the motherboard. The rathr quaint message "not any discs found" is because the controller is enabled but finds no raid discs. if you don't want to use raid, then just disable the controller in the bios and the message wikk go away.