Western Digital 2TB Surveillance Hard Drive, 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5" - PurpleDigital storage capacity 2 TBHard disk interface Serial ATAConnectivity technology SATABrand Western Digit..

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..