The Intel(R) 8 Series SATA AHCI Controller - 9C03 is a Windows driver that supports the SATA (Serial Advanced Technology Attachment) interface on systems with Intel 8 Series chipsets. Specifically, this driver manages the communication between the operating system and storage devices (such as hard drives and SSDs) connected to the SATA ports on your motherboard, using the AHCI (Advanced Host Controller Interface) protocol.