Model Number: WD84PURZ This is a current model, 8TB Purple drive from the HGST series. Two drives are included. Usage Hours: 7738 hours (10 months) 8505 hours (11 months) Low usage hours. Capacity: 8TB, for surveillance cameras, security systems, recording, and continuous operation. CMR (Conventional Magnetic Recording) video. ★ Designed and engineered for 24/7 reliability. ★ Designed for high-resolution, always-on surveillance security systems with up to 8 hard disk drives and up to 64 cameras. ★ High-endurance surveillance system drives made for both DVR and NVR security systems. [Cache Size] 256MB [Form Factor] SATA HDD [Interface] 3.5 inch [Compatibility] WD Purple recording recorder storage for surveillance systems supports up to 64 cameras per drive. It is also designed for high-resolution surveillance security systems with 8 or more bays, operating 24/7. Uncompromising storage for surveillance systems. WD Purple drives are built to handle the demands of 24/7 video surveillance recording. These drives are built for surveillance systems and are durable against excessive heat fluctuations and equipment vibrations within NVR environments. Regular desktop drives are designed for short-term operation and are not suitable for the demanding 24/7 environments of high-resolution surveillance systems. WD Purple drives are reliable surveillance system storage, tested for compatibility with a wide range of security systems. Unique AllFrame™ technology reduces frame loss and improves overall video playback quality. Genre: HDD Type: 3.5-inch SerialATA internal WD84PURZ WD82PURZ Hard Disk HDD Surveillance Video