This message was posted on behalf of Intel Corporation
msf4087: Thank you very much for contacting the Intel® Rapid Storage Technology communities. We will do our best in order to assist you with this scenario.
In regard to your inquiry, what we can try is to reset both of the disks to non-RAID in the Ctrl+i menu and then create the RAID 1 volume from scratch. Please follow the steps on the link below from page 30 to 32 in order to do that:
Any further questions, please let me know.