Disk 2 needs to be un-allocated space so you need to delete the volume on it
Edit: I am sure if you do it this way you are only going to end up with a software RAID. With a hardware RAID you would only see the 1 disk and the mirror would be hidden I would have thought. Consult the manual that came with the RAID card?
Then you just need to delete the volume on the empty disk so it is un-allocated space, then right click the other disk and add mirror and you should be able to select the un-allocated space.
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