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Silver 3.5 inch SATA hard drive with green label

Western Digital

Western Digital WD64PURZ 6TB 3.5" SATA internal hard drive

SKU CH-N74N-F3Q7Z MPN WD64PURZ

Surveillance-class 6 TB CMR drive with 256 MB cache and 5400 RPM, rated for 180 TB/year workload in 24/7 NVR systems

  • Total capacity6 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeStandard Packaging
  • Flash memory capacity6 TB
  • Recording methodCMR

Model 6TB 5400RPM

  • Designed for 24/7 surveillance workloads up to 180TB per year
  • AllFrame technology reduces frame loss and improves video playback
  • CMR recording with 256MB cache for consistent write performance
  • 5400 RPM SATA 6.0Gb/s interface in standard 3.5 inch form factor
  • 6TB capacity built for NVR compatibility and constant operation

Surveillance storage for 24/7 recording

The WD Purple WD64PURZ is a 6TB 3.5-inch internal hard drive built for continuous operation in network video recorders. It uses CMR recording technology and a SATA 6.0Gb/s interface to sustain the constant write workloads that surveillance systems demand. All Frame technology helps reduce frame loss during multi-stream recording.

Upgrade from desktop drives for always-on duty

Standard desktop drives are rated for intermittent use and can struggle with the vibration and heat of a multi-bay NVR running 24 hours a day. This drive carries a workload rating of up to 180TB per year and is tested for compatibility across a broad range of security platforms. The jump is worth it when footage gaps or drive failures are not an option.

SATA interface caps peak throughput

The SATA 6.0Gb/s link limits maximum sequential transfer rates regardless of the drive's internal cache of 256MB or its 5400 RPM spindle speed. Systems needing higher sustained bandwidth for many concurrent high-resolution streams may hit this interface ceiling. Builds requiring faster random access or a smaller form factor cannot be served by this 3.5-inch SATA design.

How it compares

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

Price $261.99
Pricier than about 78% of the 4,938 comparable items (median $107.99).
Total capacity 6 TB
Higher than about 75% of the 2,372 comparable items (median 2 TB).
Price per TB $43.67 per TB
Cheaper than about 67% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Model nameWD64PURZ
Part numberWD64PURZ
Total capacity6 TB
Recommended useFor Video Surveillance
Performance
Rotational speed5,400 RPM
Memory
Flash memory capacity6 TB
Storage
Recording methodCMR
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height5.79 in x 4.0 in x 1.03 in
Maximum width5.79 in x 4.0 in x 1.03 in
Maximum length5.79 in x 4.0 in x 1.03 in
Shipping weight0.57 kg
Package size142 × 103 × 27 mm

Other versions of this model

5 more in the same range

Questions about this item

What are the exact dimensions of this 3.5-inch drive so I can confirm it fits my NVR bay?

The drive measures 5.79 inches long, 4.0 inches wide and 1.03 inches high, matching the standard 3.5-inch form factor used in most surveillance enclosures.

Which cables and jumpers are required to install the WD64PURZ in a typical NVR?

Connect a standard SATA 6.0Gb/s data cable and a SATA power cable; no jumpers are needed because the drive uses native SATA addressing.

How often should I expect to replace this drive given its 180 TB per year workload rating?

At the rated 180 TB per year, a 6 TB drive running 24/7 in a typical surveillance array will reach its workload limit after roughly three years of continuous recording.

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