There are 5 parts to this article:
Part1 – Part2 – Part3 – Part4 – Part5

An error may pop up that says “Logical Disk Manager could not update the boot file for any boot partitions on the target disk. Verify your arcpath listings in file boot.ini or through the bootcfg.exe utility.” Well, we are mirroring the first drive to the second, and the first drive doesn’t even have a filesystem, so it makes sense that we can’t update the boot file. We chose to ignore this error:

The RAID1 array is building:

The RAID1 array is done and healthy:

Let’s reboot and remove the original drive, putting the mirrored drive in its place. After the boot, this shows up in the system event logs:

We have a missing drive in computer management/disk. Remove the mirror: