Western Digital 3TB WD Purple Surveillance Internal Hard Drive HDD - S is built for 24/7 surveillance and AllFrame technology for better performance. It is designed to support up to 64 HD cameras and has a 3-year manufacturer's limited warranty. The WD Purple drive is engineered for compatibility with your existing security system. AllFrame 4K technology ensures smooth playback and recording, even when dealing with multiple cameras. With support for up to 64 cameras, you can expand your system to cover every angle. WD Purple drives are built for reliable recording in intense security monitoring systems. They can handle up to 64 cameras and feature AllFrame 4K technology for smooth playback and recording.