Free products:Western Digital Red 4TB NAS Hard Disk Drive – 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch – WD40EFRX – reviews Amazon

Western Digital Red 4TB NAS Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD40EFRX

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Specifically designed for use in NAS systems with up to 8 bays
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 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
3 year manufacturer`s limited warranty