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The HBAA40W-AG is a HBA (Host Bus Adapter), a device used to connect a host computer to an attached storage device, such as a SAN (Storage Area Network) or RAID (Redundant Array of Independent Disks) system. It supports 8 Gb/s Fibre Channel connections, allowing up to four drives to be connected simultaneously, and is capable of data rates as high as 4.0 Gb/s per port. The adapter features integrated iSCSI accelerators, which help to speed up data transfers. Additionally, the adapter comes with support for most popular operating systems, including Windows, Linux, VMware, and Solaris. The HBA adapter is made by Broadcom, and is part of the CNDW (Channel Network Data Warehouse) series.