This ThinkSystem 2.5" SAS/SATA/NVMe 2x2 Bay Backplane Kit for the ThinkSystem SR950 Server supports a choice of SATA, SAS, or U.2 (NVMe) PCIe drives. This design enables the flexibility to configure some of the bays with high-performance PCIe solid state drives while still using the other bays for high-capacity hard drives, an ideal solution for storage-tiering. The top two drive bays support SAS, SATA, or NVMe interface drives while the bottom two bays support SATA or SAS drives only.