In Windows 7 Pro, I made a software mirror raid of two sata data drives through disk management - not through the motherboard bios. I want to be able to move the disks to another computer in the future. To test a raid failure, I disconnected one of the drives and booted into Windows 7. Surprisingly, there was absolutely no warning at all that one of the drives has failed. There was no triangle in the system tray or any pop-up messages. The "mirror" with only one drive seemed to work perfectly. I went into disk management and it shows the "Failed Redundancy" on the missing drive. I couldn't even find an error in the event viewer of the failed drive. I even tried Windows Troubleshooter and it didn't even tell me about the missing drive. Obviously, if there isn't some kind of warning somewhere of the failed drive, I'd never know the raid is degraded. Is there a service maybe I turned off which would allow this warning to show up? How does windows let someone know the mirror raid is degraded???