This message was posted on behalf of Intel Corporation
Thank you very much for taking the time to reach the Intel® Communities Team.
I understand that you would like to know why your RAID 1 was degraded when your computer restarted. Allow me to help you regarding this issue you are facing.
In this case, when the system suddenly turns off, the Operating System and the Intel® Rapid Storage Technology will verify that the system is synchronized and working properly. What could happen was that as a result of the system suddenly rebooting some data in one disk could get damaged or a disk was not synchronized with the other so it degraded the RAID array.
I hope this answers all your questions.