Thx for the reply and the suggestions. I read the link/info. I have the latest rev of the driver for the Promise Raid controller on my MB; and similarly, I have the latest BIOS for the MSI MB.

An update: I am now running again. After NAV scans, I ran the sfc /scannow (courtesy previous suggestion REVEREND) command and this may have helped? In any case, I was able to limp one of the RAID1 drives, after the scannow command, I restored the array via the Promise Bios SW, imaged the good drive to the faulty drive, and haven't had an issue since. Another possibility is I have a bad cable/connection that created an intermittent fault that I had to recover from.

I don't think you've heard the last of me on this issue though....Thx.

Scott