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I believe there has some requirement when use 2TB or great capacity storage use
For your board's need RAID option ROM version v10.6.0.1091, this is include latest BIOS
Need UEFI boot, its in Boot option in BIOS.
Enabled AHCI, and install Microsoft AHCI driver.
And OS, if use Windows XP 32bit then still can not use HDD, if Win XP 64bit, can use GPT disks as secondary storage only
If Windows Vista 32bit & Win7 32bit can only support HDD/RAID >2TB for data storage.
If Win7 64bit or Vista 64bit can use boot partition.
I hope this is helpul for you.