Amazon.com: Seagate Skyhawk ST4000VX013 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Network Video Recorder, Video Surveillance System Device Supported : Electronics
Seagate SkyHawk Surveillance 4TB 5900 RPM SATA III 6Gb/s 3.5" Internal CMR Hard Drive - Micro Center