This Western Digital 4TB hard drive is perfect for your surveillance system. It is designed to handle high-intensity workloads, making it ideal for continuous recording applications. It has a SATA III interface which provides fast transfer speeds and features a 3.5-inch form factor. The drive is compatible with a range of surveillance systems and is perfect for use in both personal and business environments. The WD Purple 4TB hard drive is a reliable and durable option for your surveillance needs.