OVERVIEW :
Capacity & Interface: 4 TB of storage, with a SATA III interface at up to 6 Gb/s. 
Cache: Equipped with a 256 MB cache buffer for smoother recording performance. 
Rotational Speed: Typically rated at 5400 RPM. Some sources mention 5640 RPM, reflecting WD's variable-speed “IntelliPower” tuning.
Surveillance Optimization: Built with WD’s AllFrame technology, supporting up to 64 HD cameras, 180 TB/year workload, and compatibility with 16-drive bays—ideal for NVR/DVR setups.
Durability & Reliability:
Designed for 24/7 operation with tarnish‑resistant components.
MTBF up to 1 million hours.
Load/unload cycles rated at 300,000.
Non-recoverable error rate: less than 1 in 10¹⁴ bits read. 
Power Consumption & Environmental Specs (retail kit):
Active: ~4.7 W; Idle: ~4.3 W; Standby: ~0.3 W
Operating: 0–65 °C / Storage: –40–70 °C
Noise: ~27 dB active, ~23 dB idle
Size: ~147 × 101.6 × 25.4 mm; Weight: ~0.7 kg / 1.5 lb
 
WARRANTY DETAILS :
Backed by a 3‑Year Limited Warranty, standard across WD Purple drives.