Hello, something has happened to my RAID 1 group using an Sil 3124 Controller. The two 1TB drives have been mirrored for more than a year. Together, they are my "M" drive. My Windows Vista no longer shows my M drive in Explorer. I don't know what to look for or how to find out if the drives are working or not. Any suggestions? Being mirrored, I thought I'd still be able to see my M drive if one of the pair of 1TB drives has failed.