I believe that he is using 2 new drives as Raid and wants to use the old (3rd) -drive as a data disk, but it is not recognizing the drive. The suspicion being that the new RAID configuration is not allowing the BIOS to recognize the old drive. I could be wrong in this, and would ask for the OP to give a little more detail.
It could be that if you go to disk manager, in Windows, you will see the old drive and need to give it a new drive letter for it to be recognized. -Do not reformat it or do anything like that or you will lose all your data. I am assuming you have loaded the operating system on the new Raid, and that it will boot.
If the BIOS is old enough, research and see if you need a newer version to make it work.
If all else fails, buy an enclosure and use the old drive as an external drive.
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Last edited by PcolaDennis; 03-27-2015 at 06:54 PM.