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Silver 3.5-inch internal hard drive with circuit board visible on underside

Western Digital

Western Digital WD121PURP 12TB 7200 RPM 256MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-5BFD-T2KNG MPN WD121PURP

12 TB 7200 RPM SATA drive with 256 MB cache built for 24/7 AI video surveillance workloads up to 550 TB/year

  • Total capacity12 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • Cache memory256 MB
  • Designed for 24/7 AI video recording
  • AllFrame AI technology reduces frame loss
  • Supports up to 64 HD camera streams
  • 550 TB yearly workload rating for heavy capture
  • 5 million hours MTBF for reliability

Engineered for AI video workloads

The WD Purple Pro WD121PURP is a 12TB 3.5-inch internal hard drive built for advanced smart video recorders, analytics appliances and deep-learning servers. It supports up to 64 single-stream HD cameras and handles multi-stream smart cameras in always-on environments. The drive is designed for 24/7 operation with a workload rating up to 550TB per year.

Thermals, noise and power in normal use

The drive operates at 7200 RPM with a SATA 6.0Gb/s interface and 256MB cache for sustained throughput in multi-bay enclosures. Tarnish-resistant components add robustness for harsh environments and continuous duty cycles. An MTBF of up to 2.5 million hours reflects the engineering target for high-reliability video surveillance deployments.

What the bundled technology changes

OptiNAND technology in the 22TB family member demonstrates the architecture direction for high-capacity AI-enabled recording. AllFrame AI technology improves ATA streaming to reduce frame loss and improve video playback quality. These features target the specific demands of AI-enabled recorders, video analytics appliances and cloud-based storage including RAID and JBOD configurations.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $302.99
Pricier than about 82% of the 4,938 comparable items (median $107.99).
Total capacity 12 TB
Higher than about 90% of the 2,372 comparable items (median 2 TB).
Price per TB $25.25 per TB
Cheaper than about 89% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product linePurple Pro
Model nameWD121PURP
Total capacity12 TB
Recommended useFor Video Surveillance
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeHard Drive
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight0.64 kg
Package size147 × 104 × 28 mm

Questions about this item

How do I install the WD121PURP 3.5" drive and what step is often missed?

Mount the drive in a 3.5" bay using four screws, connect the SATA 6.0Gb/s data cable and the SATA power cable, then verify the 12TB volume appears in BIOS before formatting.

What maintenance or replacement will the WD121PURP need during its service life?

The drive is rated for a 550TB/year workload and 2.5 million hours MTBF; plan replacement once the accumulated write volume approaches the annual rating or after the MTBF interval.

What limit appears first when the WD121PURP runs 24/7 video recording?

The 550TB/year workload rating is the first sustained-use ceiling; exceeding it reduces the 2.5 million-hour MTBF expectation for the 12TB Purple Pro drive.

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