The Marvell 91xx SATA 6G Controller is a driver software package for the Marvell 91xx series of SATA controllers, which are typically used in computers for managing hard drives, SSDs, and other storage devices. These controllers support SATA 6 Gb/s (SATA III) connections, offering faster data transfer speeds compared to older SATA versions (e.g., SATA II or SATA I).

This driver ensures that Windows can recognize and communicate properly with the Marvell SATA controller hardware, enabling stable and efficient operation of your connected storage devices.