WD Purple 2 TB Surveillance Systems Purple SATA Internal Hard Disk Drive (HDD) (WD23PURZ-85C5HYO)  (Interface: SATA, Form Factor: 3.5 inch)

Designed for 24*7 systems All WD Purple drives are equipped with AllFrame technology, which improves ATA streaming to help reduce frame loss, improve overall video playback, and increase the number of hard drive bays supported within an NVR WD Purple drives with AllFrame 4k technology feature a workload rating of up to 180TB/year - up to three times that of desktop drives - to handle the unique demands of modern video surveillance DVR and NVR systems WD Purple hard drives are built with compatibility in mind, so you can quickly and seamlessly add capacity to your surveillance system. As an industry-leading hard drive manufacturer, Western Digital stands behind their surveillance storage solutions with a 3-year limited warrant