Western Digital WD40EFPX 4TB 3.5" LFF 6Gbps WD Red Plus NAS SATA Hard Drive
Model Number WD40EFPX. Formated Capacity 4TB / 4000GB. Western Digital partners with a wide range of NAS system vendors forextensive testing to ensure compatibility with most NAS enclosures. Tuned for NAS with NASware™.