Hhmmm... Have you tried this with UEFI enabled?
emmm...The MSI P55-GD85 does not seem to support UEFI.
Today I try to use 2T hard drive, it works fine. So the P55 RAID mode does not support 3T hard drive
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Yea, that jives with my recollection. Unfortunately, I donated my Intel DP55KG-based system (which did have UEFI support in its BIOS) to a charity some time ago, so I cannot verify whether enabling UEFI would have supported the use of larger drives.