WD purple trade; drives are built for 24/7, always-on, high-definition security systems. With a supported workload rate1 of up to 180 tb/yr and support for up to 64 cameras, wd purple trade; drives are optimized for surveillance systems. WD purple trade; surveillance storage also comes with WD rsquo;s exclusive allframe 4k trade; technology, so you can confidently create a security system tailored to the needs of your business. Using allframe 4k trade; technology, wd purple trade; drives improve ata streaming to help reduce errors, pixelation, and video interruptions that could happen in a video recorder system.