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Silver 3.5 inch bare SATA hard drive with green label

Western Digital

Western Digital WD20PURZ Purple 2TB 3.5" SATA 5400 RPM 64MB internal hard drive

SKU CH-RB7M-08TKM MPN WD20PURZ

3.5" SATA drive built for surveillance recording with 64 MB cache and 180 TB yearly workload rating

  • Total capacity2 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed5,400 RPM
  • Designed for surveillance systems with AllFrame technology
  • Handles up to 180TB per year workload rating
  • 64MB cache boosts write-intensive streaming performance
  • 5 inch form factor fits standard drive bays
  • SATA 6.0Gb/s interface ensures broad compatibility

WD Purple 2TB SATA surveillance drive

The WD Purple WD20PURZ is a 2TB 3.5 inch internal hard drive built for video surveillance systems. It spins at 5400 RPM with a 64MB cache and connects through a SATA 6.0Gb/s interface. The drive is engineered for write-intensive, low bit-rate workloads typical of security recording.

Fits standard 3.5 inch drive bays

The unit measures 147.00mm long, 101.60mm wide and 26.10mm high, matching the standard 3.5 inch form factor. It requires a SATA power connector and a SATA data cable from the host controller. AllFrame technology and ATA streaming support reduce frame loss, freeing the system from managing video stream integrity in software.

Suits installers building

The 180TB per year workload rating and multi-bay support make it appropriate for continuous recording in home or small-business surveillance. It is not intended for general-purpose desktop storage, high-performance gaming libraries, or applications that demand low-latency random access. Buyers needing faster access times or higher sequential throughput should consider drives designed for those workloads.

How it compares

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

Price $53.99
Cheaper than about 75% of the 4,938 comparable items (median $107.99).
Total capacity 2 TB
Typical for this category: the median of 2,372 items is 2 TB.
Price per TB $27.00 per TB
Cheaper than about 86% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product linePurple
Model nameWD20PURZ
Total capacity2 TB
Recommended useFor Video Surveillance
Performance
Rotational speed5,400 RPM
Storage
Flash memory typeHard Drive
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 weight0.73 kg
Package size211 × 165 × 112 mm

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