U.2 Solid State Drives (formerly known as SFF-8639) are designed for high-performance, enterprise-level storage applications. These drives combine the speed of PCIe with the flexibility of the SATA form factor, making them ideal for use in servers and workstations. U.2 Solid State Drives can be easily swapped out and connected to a system via a U.2 interface, providing faster data transfer rates and lower latency compared to traditional SATA-based Solid State Drives.