Storing hours upon hours of CCTV content cannot get any easier with the Western Digital WD40PURX 4TB Hard Drive. This hard drive has the power to support 32 HD cameras running at the same time. Optimized for surveillance storage, storing multiple channels of video input is no hassle for this hard drive. While most hard drives cannot handle being under load 24/7, you can set your mind at rest knowing that the WD Purple Surveillance Hard Drive can do it with ease. With 32 HD camera support, upgrading or expanding your security system is as easy as any other system. You keep your home, or small to medium business safe with this product. The WD40PURX hard drive from Western Digital features 4TB of storage size in a 3.5" form factor. This drive connects to your system via the SATA 6 Gb/s interface so make sure you have an available port on your compatible motherboard. Advanced features of this HDD include a 64MB cache/buffer and 5400 rotational spin rate.