➀ Western Digital's Ultrastar DC SN861 SSDs use Fadu's FC5161 controller, a South Korean company specializing in enterprise SSD solutions. ➁ The FC5161 supports 16 NAND channels and offers advanced enterprise features like OCP Cloud Spec 2.0 and SR-IOV. ➂ The SN861 provides high-speed performance with sequential read speeds up to 13.7 GB/s and write speeds up to 7.5 GB/s, available in capacities from 1.6 TB to 7.68 TB.