The Western Digital Purple 2TB 3.5" SATA III (models: WD22PURZ/ WD23PURZ) is a specialized internal hard drive (HDD) optimized for 24/7 video surveillance . It is designed to withstand continuous data writing, high temperatures, and vibrations in DVR and NVR systems.

• Capacity: 2 TB
• Size (Format): 3.5 inches
• Interface: SATA III (6 Gb/s)
• Rotation speed: 5400 RPM (low consumption class and quiet mode)
• Cache memory: 64 MB or 256 MB (depending on exact model subvariant)
• Transfer speed: Up to 175 MB/s