This message was posted on behalf of Intel Corporation
There is a 2TB size limitation. If you enable UEFI this limitation could be bypassed but if there is no UEFI at all, this might be expected.
The maximum size limitation for your chipset controller is 256 TB.
The option ROM can only be updated by a BIOS update and the BIOS update must specify that the ROM is going to be updated.
See here for more information RAID Features by Chipset or Controller Hub.