The Wellsburg 6-Port SATA AHCI Controller - 8D02 is a driver for a SATA (Serial Advanced Technology Attachment) controller used in computers to manage data transfers between the motherboard and storage devices like hard drives (HDDs) or solid-state drives (SSDs). The driver is specifically for a chipset that may be part of Intel's "Wellsburg" family, often associated with Intel's 100-series chipsets.

The AHCI (Advanced Host Controller Interface) is a standard that allows the operating system to communicate efficiently with the SATA controller, supporting features like Native Command Queuing (NCQ) and hot swapping of drives.