The WD Purple 4TB Surveillance Internal Hard Disk Drive is a 3.5″ SATA drive with a data transfer rate of 6 Gb/s that is designed to withstand the stresses placed on it in a 24/7 surveillance system. With support for up to 32 high-definition surveillance cameras, this 4TB hard drive can hold a large amount of data and gives you the ability to easily upgrade and expand your security system.
