I tried reseting to Non-RAID (both HDD - i.e. 1 original bootable, and 1 empty), and restart. Unfortunately, it still cannot find boot media. I tried settings using Storage config as RAID, IDE, AHCI. None seems to work. I disconnect the new emnpty drive to make sure that I have only the original boot drive there. It still did not work. I think the data should still be there as both the process of "Create RAID volume" and "Reset to Non-RAID' were done instantly without any physical erasing of data. Please help me to retreive it. Very desparate. Many thanks for helping.