QNAP QXP-1620S-B3616W ,Broadcom SAS3616W Tri-mode 4-port SAS HBA PCIe Expansion CardThe SAS HBA PCIe Expansion Card is designed for expanding the capacity of a QNAP NAS by connecting it to TL SAS JBOD storage enclosures and REXP expansion units. Multiple expansion units can be daisy chained via high speed mini SAS HD cables to expand the total disk capacity up to 4. 6PB to meet growing data storage needs. SAS based storage solutions can assist businesses in creating highly reliable IT environments for virtualization, surveillance,