The WD85PURZ is a 8TB Hard Disk Drive (HDD) from Western Digital's (WD) Purple series, designed specifically for surveillance and security systems. This 3.5-inch SATA HDD operates with a 6Gb/s interface and is tailored to meet the storage demands of 24/7, always-on, high-definition surveillance systems. With a 128MB cache, it ensures smooth video playback and consistent recording quality, even in environments with multiple surveillance cameras. The WD Purple series is engineered with WD's exclusive AllFrame technology, which improves ATA streaming to help reduce video frame loss, enhance the playback, and increase the number of drive bay supported. This makes the WD85PURZ an ideal choice for surveillance DVRs and NVRs, especially those requiring dependable recording and playback of video footage in high definition. Its robust build and reliability make it suitable for various security applications, from home surveillance to large-scale commercial installations.