Western Digital 12TB WD Purple Pro
12TB WD Purple Pro (WD121PURP) surveillance HDD: 3.5" SATA, 7200 RPM, 256MB cache, 550TB/yr—ideal mass storage for always‑on NVR/AI systems.
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Product overview
Released on May 18, 2021, the 12TB WD Purple Pro (WD121PURP) belongs to Western Digital’s surveillance‑focused Purple Pro HDD family built for AI‑enabled recorders and analytics backends.
Positioned in the workstation tier, it exists to handle continuous, multi‑stream video with an enterprise‑class 550 TB/year rating and 5‑year warranty. As a 3.5-inch SATA 6 Gb/s HDD with 7200‑RPM platters and a 256 MB cache, it’s best used as mass storage for long‑term video retention, NVR/NAS arrays, or other bulk archives where sustained writes and endurance matter more than seek speed. Unique note: it uses AllFrame AI firmware to help reduce dropped frames. Not discontinued as of July 2026.
- mass storage
Product highlights
- Engineered with advanced capabilities needed for high-end smart video solutions
- High performance, reliability and workload capability for advanced AI-enabled recorders, video analytics appliances, deep-learning servers and cloud-based storage
- Supports up to 550 TB/yr workload rate**.
- Designed with tarnish-resistant components for harsh environments, and with additional robustness for multi-bay enclosures
Specifications
- Capacity
- 12 TB
- Type
- HDD
- Form factor
- 3.5
- Hardware Interface
- SATA
- Data Transfer Rate
- 600 MB
- Read speed
- 245 MB/s
- Tdp
- 6 W
