Accessing unused portion of a RAID 5 disk

I replaced a failed 1 TB drive in a RAID 5 volume with a new 2 TB drive. Rebuilding the volume used only half the new drive. How can I use the remaining portion as a virtual drive? Windows Disk Management doesn't show any unallocated space. I have Windows 8.1 and the Intel RST RAID controller. Which product would I need if this is possible?

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