WD Red 4TB SATA 6 Gb/s 3.5″ NAS Internal Hard Drive, 5400 RPM Class, 256 MB Cache, Supports Up to 180TB/yr Workload Rate, NASware Firmware for Compatibility | WD40EFAX

Western Digital WD Red 4TB NAS Internal Hard Drive – 5400 RPM Class, SATA 6 Gb/s, 256 MB Cache, 3.5″ Specifically designed for use in NAS systems with up to 8 bays Supports up to 180TB/yr workload rate NASware firmware for compatibility Small and home office NAS systems in a 24×7 environment Specifically designed for use in NAS systems with up to 8 bays Supports up to 180 TB/yr workload rate Rate is defined as amount of user data transferred to or from drive. Workload Rate is annualized (TB transferred times (8760/recorded power-on hrs)). Workload Rate will vary on hardware/software components NASware firmware for compatibility Small and home office NAS systems in a 24/7 environment