Western Digital 4TB Surveillance Harddisk (Purple Series) - WD40PURZ

Device Type: 3.5-Inch Internal Surveillance Hard Drive
Model / SKU: Western Digital WD Purple (WD40PURZ / WD42PURZ / WD43PURZ)
Capacity: 4TB
Form Factor: 3.5-Inch
Interface: SATA 6 Gb/s
Disk Speed: 5400 RPM
Cache Size: 64MB (WD40PURZ) / 256MB (WD42PURZ / WD43PURZ)
Recording Technology: CMR (Conventional Magnetic Recording)
Workload Rate: Up to 180 TB/year
Camera Support: Up to 64 Single-Stream HD Cameras
Drive Bays Support: Up to 16 Bays (for 4TB and higher capacities)
MTBF: 1,000,000 Hours (WD40PURZ) / 1.5 Million Hours (WD42/43PURZ, variant dependent)
Power Consumption: Approx. 3.3W (Read/Write) / 2.9W (Idle)
Operating Temperature: 0°C to 65°C
Dimensions & Weight: 147.07 × 101.6 × 26.16 mm, Approx. 450–550 g
Warranty: 3-Year Limited Warranty
Key Specs: WD Purple 4TB, WD40/42/43PURZ, 3.5" SATA 6Gb/s, 5400 RPM, CMR, 180TB/year Workload, AllFrame Technology, 24/7 Surveillance Optimized, 16-Bay Support, 3-Year Warranty
Usage: DVR & NVR Surveillance Systems, 24/7 Continuous Video Recording, Multi-Camera Security Deployments, High-Write Workload Environments