Western Digital Ultrastar DC SN200 HUSMR7664BHP301 / 0TS1501 / 0TS1304 6.4TB / 6400GB HH-HL / Half Height-Half Length AIC / Add-in Card 126GBps Multi-Level Cell MU / Mixed Use PCI Express / PCIe 3.0 x8 NVMe 1.2 SSD / Solid State Disk Drive.