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Bare 3.5 inch SATA hard drive, silver aluminium casing, circuit board visible underneath

Western Digital

Western Digital WD181PURP-Dup 18TB 7200RPM 512MB Cache SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-HMGK-8T1PW MPN WD181PURP-Dup

High-capacity surveillance storage handling up to 32 AI streams and 550 TB/yr workload for advanced video analytics

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Flash memory typeHard Drive
  • Rotational speed7,200 RPM
  • 18 TB capacity for massive surveillance archives
  • 7200 RPM with 512 MB cache for sustained multi-stream recording
  • AllFrame AI technology supports up to 32 AI streams per drive
  • 550 TB/yr workload rating for always-on reliability
  • Tarnish-resistant design built for multi-bay enclosures

18 TB Purple Pro Surveillance Drive

This 18 TB 3.5-inch internal hard drive uses a SATA 6.0 Gb/s interface, spins at 7200 RPM and carries a 512 MB cache. It is engineered for always-on AI-enabled recorders, video analytics appliances, deep-learning servers and cloud-based storage that demand high capacity and sustained write performance.

Suits multi-bay AI video systems.

The drive supports up to 32 AI streams per drive for deep-learning analytics and is built with tarnish-resistant components for harsh environments and operational vibration in larger enclosures. Buyers who need storage for only a few cameras or who require a different interface should look at other options.

550 TB yearly workload with 32 AI streams

A 550 TB per year workload rating provides headroom for continuous high-bitrate recording and analytics across many channels. The 32-stream AI limit defines where deep-learning analytics capacity runs out, while the single SATA link sets the maximum sequential throughput ceiling.

How it compares

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

Price $345.99
Pricier than about 86% of the 4,938 comparable items (median $107.99).
Total capacity 18 TB
Higher than about 93% of the 2,372 comparable items (median 2 TB).
Price per TB $19.22 per TB
Cheaper than about 93% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Product linePurple Pro
Model nameWD181PURP
Total capacity18 TB
Recommended useFor Video Surveillance
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeHard Drive
Cache memory512 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.75 kg
Package size191 × 64 × 42 mm

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