WD4002FFWX-68TZ4N0 Western Digital Red Pro 4TB 7200RPM SATA 6Gbps 128MB Cache 3.5-inch Internal Hard Drive

"Professional solutions Designed specifically with SMB customers in mind, WD Red Pro is available for up to 16 bay medium to large-scale NAS environments. Engineered to handle increased workloads from your business "NAS for Big Business. Increase the efficiency and productivity of your business with WD Red Pro hard drives for up to 16 bay NAS system. WD Red Pro comes equipped with NASware 3.0, which increases system compatibility allowing for seamless integration with your existing network infrastructure. Add value to your business by enabling your employees to quickly share their files and back up folders reliably with WD Red Pro NAS hard drives in your NAS solution." "Exclusive NASware 3.0 technology Our exclusive advanced firmware technology, NASware 3.0 enables seamless integration, robust data protection and optimal performance for NAS systems operating under heavy demand."