Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD40EFPXHard disk interface Serial ATA-600Connectivity technology SATABrand Western Digita..

Engineered for Surveillance: WD Purple drives are built for always-on environments, ensuring they can handle the demands of high-definition surveillance systems.AllFrame™ Technology: Exclusive to WD P..