Western Digital Purple Surveillance HDDs

Western Digital Purple Series — Capacity & Performance Matrix Capacity Product Tier RPM Class Cache Buffer Workload Rating Drive Bays Supported Warranty 2 TB WD Purple 5400 RPM 64 MB 180 TB / Year Up to 8 Bays 3 Years 4 TB WD Purple 5400 RPM 256 MB 180 TB / Year Up to 8 Bays 3 Years 6 TB WD Purple 5400 RPM 256 MB 180 TB / Year Up to 8 Bays 3 Years 8 TB WD Purple / Pro 5640 / 7200 RPM 256 MB 180 / 550 TB / Year Up to 24 Bays 3 / 3 Years 10 TB WD Purple Pro 7200 RPM 256 MB 550 TB / Year Up to 24+ Bays 3 Years 12 TB WD Purple Pro 7200 RPM 256 MB 550 TB / Year Up to 24+ Bays 3 Years 18 TB WD Purple Pro 7200 RPM 512 MB 550 TB / Year Up to 24+ Bays 3 Years 22 TB WD Purple Pro 7200 RPM 512 MB 550 TB / Year Up to 24+ Bays 3 Years Storage Architecture & Video Features Surveillance Video Capabilities Streaming Firmware WD AllFrame™ (2TB–6TB) / AllFrame AI™ (8TB–22TB) Cameras Supported Up to 64 HD Single-Stream Surveillance Cameras AI Analytics Streams Up to 32 Additional Concurrent AI Streams (WD Purple Pro) Recording Technology CMR (Conventional Magnetic Recording) across all capacities Hardware Architecture Form Factor 3.5-inch Standard Hard Disk Drive Interface SATA 6 Gb/s (Backward compatible with SATA 3 Gb/s) Rotational Speeds 5400 RPM Class (Standard) | 7200 RPM Class (Purple Pro) Cache Buffers 64MB (2TB) | 256MB (4TB–12TB) | 512MB (18TB–22TB) Multi-Drive Systems Tarnish-resistant components suited for high-density multi-bay chassis Reliability, Environmental & Compliance Reliability & Duty Cycle Workload Rating 180 TB/Year (Standard Purple) | 550 TB/Year (Purple Pro) Mean Time Between Failures 1,000,000 Hours (Standard) | Up to 2,500,000 Hours (Pro) Load / Unload Cycles 300,000 (Standard) | 600,000 (Purple Pro) Unrecoverable Read Errors < 1 in 10^14 bits (Standard) | < 1 in 10^15 bits (Pro) Environmental & Thermal Operating Temperature 0°C to 65°C (Base Casting Operating Temp) Non-Operating Temp -40°C to 70°C Shock Resistance Operating: Up to 70 G (2ms) | Non-Operating: Up to 300 G (2ms) Warranty & Standards Limited Warranty 3-Year Limited (Standard) | 3-Year Limited (Purple Pro) NDAA & Regulatory NDAA Compliant, RoHS, CE, FCC, UL, WEEE