Seagate SkyHawk 4TB Surveillance Hard Drive - SATA 6Gb/s 64MB Cache 3.5-Inch Internal Drive (ST4000VX007)
Synology 4TB HAT5300 SATA III 3.5" Internal Enterprise
Amazon.com: MDD (MDD4TSATA6472DVR) 4TB 7200RPM 64MB Cache SATA 6.0Gb/s 3.5inch Internal Surveillance Hard Drive - 3 Years Warranty : Electronics
Purple HDD 1tb 2tb 3tb 4tb 6tb 8tb SATA 3.5' Hard Drive Disk for CCTV Camera Ahd DVR IP NVR Purple HDD - China Hard Drives for Camera and HDD for Security
Dell 04N6CY 4TB SATA 6Gb/s 7.2K rpm 3.5" LFF 512n HDD Hard Disk Drive
Amazon.com: Western Digital 4TB 3.5 Inch SATA III, 7200 RPM, 64 MB Cache Enterprise Hard Drive (Western Digital4000FYYZ) : Electronics