The Western Digital WD23PURZ 2TB 3.5″ SATA WD Purple Internal Hard Drive combines powerful storage capacity with surveillance-level reliability. With a maximum transfer rate of up to 175MB/s and 256MB of cache size for snappy performance, it’s perfect for storing large amounts of video data. Additionally, the CMR recording technology provides superior level reliability for recording video to the drive. Backed by a 3-year limited warranty, this internal drive is an ideal choice for video surveillance.