Western Digital WD40PURZ 4TB Purple Surveillance HDD

The Western Digital WD40PURZ is a 4TB internal hard drive specifically designed for security systems. It's built to run continuously (24/7) and handle the constant recording and playback of high-definition video. With a large 4TB capacity, you can store a lot of footage. Even though it runs at a slower speed (5400 RPM) to reduce noise and heat, it delivers reliable performance for your surveillance system.  This drive connects using a standard SATA 6 Gb/s connection and has a 64MB buffer for smoother data flow.