Hi Joliet_Tech,
I did a research on our older RAID software Matrix. According to the chipset controller of your motherboard, the Capacity expansion feature is not supported.
Please review the link below:
RAID Features by Chipset/Controller Hub
Intel® Rapid Storage Technology (Intel® RST) — RAID Features by Chipset/Controller Hub
Intel® Matrix Storage Console
http://download.intel.com/support/chipsets/imsm/sb/imsm_reference1.pdf
It is necessary to create a RAID volume from scratch. I suggest you to enable UEFI boot. UEFI recognizes Hard Disk Drives with 2TB or more. The drive partitions will be format to GPT instead of NTFS.
I apologize for the misunderstanding.
Regards,
Mike C