Intel S3520 Enterprise Entry, Solid state drive, encrypted, 1.2 TB, internal, FF 3.5", SATA 6Gb/s, 256-bit AES, for NeXtScale nx360 M5; System x3250 M6; x3550 M5; x3850 X6; x3950 X6; ThinkServer sd350. The S3520 Enterprise Entry SATA solid-state drives (SSDs) for Lenovo servers use Intel 3D NAND flash memory technology with a SATA 6Gbps interface to provide an affordable solution with industry leading performance.