Toshiba S300 Surveillance - Hard drive - 4 TB - internal - 3.5in - SATA 6Gb/s - 5400 rpm - buffer: 128 MB

For those serious about security, the Toshiba S300 Surveillance Internal Hard Drive has you covered from every angle. The S300 offers equally high performance and surveillance-critical reliability designed for 24/7 operation in your home office and small office video surveillance systems. Engineered for high durability, the S300 Surveillance Hard Drive supports a high workload rating and is tested to perform around-the-clock and never sleeps - so that you can.