The RAID Option ROM may report “no volumes handled by BIOS” when a capacity volume greater than 2 TB is created.
With large capacity disk drives, users can reach the 2 TB boundary for physical drives and for bootable RAID volumes. The legacy BIOS master boot record (MBR) cannot handle physical drives larger than 2 TB or boot to a RAID volume greater than 2 TB.
An MBR has a partition table describing the partitions of a storage device. The maximum size of an MBR partition cannot exceed 2 TB (2.19 TB). MBRs are constrained by supporting only four main partitions and a volume size of less than 2 TB. These constraints inhibit their use in larger volume sizes.
For these large capacity physical drives, you can use the RAID BIOS console to configure them, but they may not display during POST when the RAID OpROM scan drives.
The user must enable uEFI optimized boot in the system BIOS and use a GUID Disk Partition Table (GPT) on an Intel® Hardware RAID Array under an uEFI environment to boot from them.
A GUID Partition Table (GPT) is a layout of the partition table that enables a disk partition to exceed the MBR maximum of 2.19 TB. For more information, see Using GPT (GUID Partition Table) with Intel® RAID Controllers. This paper describes how to install an OS using GPT on an Intel hardware RAID array under an uEFI environment.