Western Digital 4 TB Purple Surveillance 3.5" Internal Hard Disk Drive Gaming Mice Built in analog scrambling helps keep Devices:10 Device Built in analog scrambling helps keep conversations private from casual listeners on the same frequency — suitable for businesses that handle sensitive operational information and want a basic layer of communication security without upgrading to digital 550 TB year workload Engineered to run continuously without the thermal and mechanical stress that causes standard desktop drives to fail under surveillance workloads The WD Purple is purpose built and rated for 180 TB year of continuous write activity — the WD43PURZ also carries a 3 year warranty that covers this use case