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#21
This isn't software RAID. That would be a RAID array defined through Windows DIsk Management, e.g.
These RAID arrays are defined by the Intel chipset hardware and exist before any software is loaded. You can define them in the UEFI. However, they do get a bit of assist from the OS driver for certain features. In some ways it's a bit of a hybrid but they're solid and OS independent. They do not have a separate CPU supporting them like a PCI card-hosted array, but are still basically hardware-level arrays.