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Adding non-RAID HDD to RAID 1

I just received my XPS 9000, with two HDD in RAID 1.  I want to add a third hard drive, from my old DImension, because it contains files I want to use on the new computer.  I've connected it and the computer recognizes it, but it is trying to put it into an array and this says the drive has "failed" because there is no companion drive.  Can anyone help me figure out what to do to add it without erasing the information on it?

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