I strongly suggest Seagate ST2000VX002.
It's quite well and design for 24*7 whole time running,
and
Seagate offer 5 years warrantyhttp://www.seagate.com/ww/v/index.jsp?l ... ntOverview-------------------
Applications
Video surveillance digital video recorder (SDVR)
Video surveillance network digital video recorder (NVR)
Direct-attached JBOD video storage
Network-attached JBOD video storage
The SV35 Series hard drives are engineered for rigorous 24x7 video surveillance systems, offering tuned performance, high capacities and durable reliability required for the high-write workloads of video surveillance systems.
The SV35 Series drives are backed by the industry-leading Seagate® 5-Year Limited Warranty.
Key Features and Benefits
2TB, 1TB and 500GB capacities
SATA 6Gb/s
Enterprise-class reliability for 24x7 video surveillance applications, with >1 million hours MTBF and <1% AFR
Leading areal densities boost performance with a smaller mechanical part count. Spin-up is current-limited at 2A to allow the use of the most energy-efficient and cool-running power supplies.
ATA-7 streaming commands optimize video streaming performance and integrity