Amazon.com: Seagate Skyhawk ST4000VX013 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Network Video Recorder, Video Surveillance System Device Supported : Electronics
Amazon.com: Seagate Skyhawk ST4000VX016 4 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Network Video Recorder, Camera, Video Recorder Device Supported : Electronics