4TB WD Red Plus NAS 5400 RPM 3.5" Internal Hard Drive

Supports up to 180 TB/yr workload rate* * Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
NASware firmware for compatibility
Small or medium business NAS systems in a 24x7 environment
3-year limited warranty