From ITE Tech.:
ITE IT8212 ATA RAID Controller:The IDE RAID controller, which is compatible with the ATA/ATAPl-6 specification and supports the IDE RAID 0/1/0+1 function, acts as an interface between the system and the IDE device. It supports not only a Scatter/Gather DMA mechanism that complies with the Programming Interface for Bus Master IDE Controller Revision 1.0, but also 2 IDE channels and up to 4 IDE devices.IT8212F features one embedded CPU and firmware to handle it. The methodology is able to improve the systems stability and reduce the driver's loading.