This WD Red Plus NAS hard drive (6TB) is built for lighter-duty 1-8 bay NAS setups, running at 5400-5640 RPM with a workload rating of up to 180TB/year. It uses CMR (Conventional Magnetic Recording) for consistent performance during RAID rebuilds and WD's NASware technology to optimize compatibility and performance inside NAS systems. It's designed to run continuously in a home or small-office NAS enclosure alongside other drives. Backed by a 3-year limited warranty. Model WD60EFZX specifically ships with 5400 RPM, SATA.