I have a Dell Power Edge 1800 server running Windows SBS 2003 SP2. The OS is installed to a 250GB SATA drive plugged into a Dell CERC SATA 1.5/6ch RAID controller. I wanted to create a mirror drive for redundancy purpose but after working with Dell tech support they informed me that the only way to create the Array is to reinstall the OS because you cannot ADD a second drive without creating a new Array which means the OS gets blown out. So, not wanting to create tons of work for myself I added the second drive to the onboard SATA controller and created the mirror set in Windows. Everything synced up and all was good for about a week. Then - mirror broke, drive died. No biggie, shutdown server pulled drive added another new drive. Week later - mirror broke and have error on mirror "Healthy (At Risk) which appears to point to another dead drive. Question: Is this just bad luck or is there something wrong with putting a second drive off the onboard that eventually produces errors that the server reports as a bad drive?