WESTERN DIGITAL WD20EFZX Red Plus, 3.5", 2TB, SATA/600, 5400RPM, 128MB cache, NAS

WD Red NAS Hard Drives are designed specifically for NAS systems that have 1 to 8 drive bays in both 3.5-inch and 2.5-inch form factors
Supports up to 180 TB/yr workload rate* |Workload Rate is annualized (TB transferred times (8760/recorded power-on hours)), workload rate will vary depending on your hardware and software components and configurations
NASware firmware for compatibility
Small and home office NAS systems in a 24/7 environment