Amazon.com has Western Digital 4TB WD Red Plus NAS Internal Hard Drive – 5400 RPM Class, SATA 6 Gb/s, CMR, 64 MB Cache, 3.5" – WD40EFRX on sale for $89.99.
- Available in capacities ranging from 1-14TB with support for up to 8 bays
- 5400RPM performance class
- 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))
- NASware firmware for compatibility
- Small or medium business NAS systems in a 24×7 environment
- 3-year limited warranty