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Purple 3.5-inch SATA internal hard drive

Western Digital

Western Digital WD33PURZ 3 TB 3.5" SATA 5400 rpm internal hard drive

SKU CH-XX75-ZYY17

3 TB 3.5" SATA internal hard drive built for 24/7 surveillance with 256 MB cache and 180 TB/year workload rating

  • Total capacity3 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed5,400 RPM
  • Cache memory256 MB
  • Recommended useFor Video Surveillance
  • Engineered for 24/7 surveillance workloads
  • AllFrame technology reduces frame loss during video capture
  • 180 TB/year workload rating supports continuous recording
  • 256 MB cache helps sustain streaming performance
  • 5" SATA 6.0 Gb/s interface fits standard NVR bays

Engineered for 24/7 surveillance recording

This WD Purple 3.5-inch internal hard drive is purpose-built for network video recorders and DVR systems that write continuously. It targets installers and system integrators who need dependable storage for multiple high-definition camera streams rather than general desktop workloads.

Sustained write workload rated at 180 TB per year

The drive handles the constant sequential writes of surveillance footage without the thermal throttling or vibration sensitivity seen in standard desktop units. All Frame technology reduces frame loss during heavy multi-stream recording so playback remains smooth over long retention periods.

3.5-inch form factor with SATA 6.0 Gb/s interface

Standard SATA data and power connectors allow drop-in installation into existing NVR bays or external enclosures. The 5400 rpm spindle and 256 MB cache keep operating temperatures manageable in always-on chassis while the purple label identifies the drive class at a glance.

How it compares

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

Price $109.99
Typical for this category: the median of 4,938 items is $107.99.
Total capacity 3 TB
Higher than about 60% of the 2,372 comparable items (median 2 TB).
Price per TB $36.66 per TB
Cheaper than about 74% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Model nameWD33PURZ
Total capacity3 TB
Recommended useFor Video Surveillance
Performance
Rotational speed5,400 RPM
Storage
Cache memory256 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

How much power does the 5400 rpm SATA 6.0Gb/s drive draw during continuous 24/7 recording?

The drive is engineered for non-stop surveillance workloads and tested to handle up to 180TB per year in NVR environments.

Does the 3.5" SATA 6.0Gb/s drive need any special controller or cabling beyond a standard motherboard port?

It connects to any standard SATA 6.0Gb/s port using ordinary data and power cables; no extra controller is required.

Will the 256MB cache SATA drive work reliably alongside older 5400 rpm desktop drives in the same enclosure?

Yes, it uses the same SATA interface and form factor, so it operates alongside legacy drives without compatibility issues.

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