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Bare 3.5-inch SATA hard drive, silver metal casing with green label

Western Digital

Western Digital WD40PURX 4TB 3.5" SATA 5400 RPM 64MB internal hard drive

SKU CH-T2FF-TA699 MPN WD40PURX

4 TB surveillance drive rated for 180 TB yearly workload with 64 MB cache and 5400 RPM SATA 6.0 Gb/s interface

  • Total capacity4 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed5,400 RPM
  • Cache memory64 MB

Capacity 4TB

  • Engineered for surveillance security systems
  • Supports up to 180TB/year workload rate
  • Tuned for write-intensive, high stream-count applications
  • Prioritised write operations for surveillance performance
  • TLER and ATA streaming support included

Surveillance storage drive

The Western Digital WD40PURX is a 4TB 3.5 inch internal hard drive built for surveillance security systems. It connects via a SATA 6.0Gb/s interface and operates at 5400 RPM with a 64MB cache. The firmware prioritises write operations to sustain high stream counts from multiple cameras.

Suited for NVR appliances and DVR arrays

This drive supports workloads up to 180TB per year and handles more than eight bays in a single enclosure. TLER and ATA streaming support help maintain continuous recording without frame loss. It is not intended for general desktop workloads, boot drives or workloads that demand low-latency random reads.

Workload rating decides fit

The 180TB yearly workload rating is the specification that determines whether this drive matches the recording volume of the deployment. Buyers who need a higher annual write budget should look at drives rated for heavier surveillance workloads.

How it compares

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

Price $155.99
Pricier than about 61% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $39.00 per TB
Cheaper than about 71% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product linePurple
Model nameWD40PURX
Total capacity4 TB
Recommended useFor Video Surveillance
Performance
Rotational speed5,400 RPM
Storage
Cache memory64 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 weight0.77 kg
Package size208 × 163 × 110 mm

Other versions of this model

5 more in the same range

Questions about this item

How do I install the WD40PURX in a surveillance NVR and what step is often missed?

Mount the 3.5 inch drive in the bay using four screws, connect the SATA data and power cables, then enable TLER or ATA streaming in the NVR firmware so write operations are prioritised correctly.

What maintenance or replacement should I expect for this surveillance drive?

The drive is rated for 180 TB per year workload; if annual writes approach that limit, plan replacement before the rated workload is exceeded to avoid degraded recording performance.

Which limit appears first under sustained write-heavy surveillance use?

The 180 TB per year workload rating is the first constraint; sustained high-stream recording that exceeds this rate will reduce reliability before mechanical wear becomes a factor.

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