Innovative engineering and design leadership are the foundation of the Lenovo ThinkServer RD550 and RD650 rack systems. By creating space-optimized drive trays, chassis and system boards, the RD550 and RD650 provide clients with industry-leading storage density and more I/O connectivity within standard 1U and 2U form factors. The RD550 can accommodate up to 12 drive bays and up to 26.4TB1 of internal storage, providing the performance and capacity of a 2U system in a 1U form factor — perfect for line-of-business applications and compute-intensive workloads. The 2U RD650 houses up to 26 drive bays and up to 74.4TB1 of internal capacity, making it perfect for storage-hungry applications, such as databases, data analytics clusters and video streaming. For ultimate flexibility and scalability, both rack servers are available with hybrid chassis configurations that allow a combination of 2.5- and 3.5-inch drives, ideal for creating a tiered storage environment. Two enterprise-class M.2 solid-state drives (SSDs) are available as an option for secure booting, as well as SD card options for hypervisor booting.