The X600 3D NAND SATA SSD combines Western Digital's state-of-the-art 64-layer 3D NAND technology with our proven SSD platform. It also incorporates nCache 2.0, a tiered caching technology designed to improve responsiveness for corporate and consumer workloads. nCache 2.0 uses a combination of both SLC (single level cell) and TLC flash blocks to improve endurance, increase efficiency, and boost performance. Writing data first to the SLC cache reduces write amplification on the TLC blocks.