Western Digital 12TB WD Purple Pro

Brand: Western Digital
Model: 12TB WD Purple Pro

$464–$512estimated range · from catalog price Jun 22, 2026

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.

Storage performance rankTop 63% of storage drives

TierWorkstation?

ReleasedMay 2021

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Capacity12 TB

TypeHDD

InterfaceSATA

Read speed245 MB/s

Form factor3.5

GixCore Editorial

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.

Best for

mass storage

Official product specifications

Specifications

At a glance iEach dot represents a catalog model. Farther right means a higher measured value, not necessarily a better fit.Measured against the storage drives catalog

Current modelCatalog models

Capacity12 TB