Please go to Configure -> Safety and select IDE/(S)ATA Drive Scan to Safe Mode.
If that doesn't help, then try to upgrade the SATA/RAID driver to the latest version. AMD SATA/RAID drivers are known to not properly return such information.
I'm sorry, I don't have a solution for this now It seems AMD goes its own way with RAID and doesn't support any standards which can be used to retrieve disk information. I hope they will add such support later, many vendors did this already...