Lenovo Internal Hard Drive - 4TB Capacity, c, SATA 6Gb/s, 600MBps Data Transfer Rate, 3.5, for ThinkSystem ST50 7Y48, 7Y49 - 4XB7A13556 at TigerDirect.com
Intel S4510 Entry - Solid state drive - 480 GB - internal - 3.5" - SATA 6Gb/s - for ThinkSystem ST50 7Y48, 7Y49 - Walmart.com
Lenovo ThinkSystem Client - Hard Drive - 1 TB - SATA 6Gb/s - 4XB7A76721