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Silver 3.5 inch internal hard drive with SATA connectors and green label

Western Digital

Western Digital WD221PURP Purple Pro 22TB 7200 RPM 512MB SATA 6.0Gb/s 3.5" internal hard drive

SKU CH-KE5V-SQHDE MPN WD221PURP

22 TB SATA drive built for 24/7 AI video surveillance with 7200 RPM speed and 512 MB cache

  • Total capacity22 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • Cache memory512 MB

Capacity 22TB

  • 22TB capacity stores weeks of high-resolution footage from 64 cameras
  • 7200 RPM and 512MB cache sustain smooth multi-stream recording
  • OptiNAND technology boosts areal density for reliable 22TB in a 3.5" drive
  • AllFrame AI reduces frame loss during continuous AI-enabled surveillance workloads
  • 550TB/year workload rating and 2.5M-hour MTBF built for 24/7 operation

Purpose-built surveillance storage

The WD Purple Pro WD221PURP is a 22TB 3.5-inch internal hard drive designed for advanced, AI-enabled smart video recorders, appliances and servers that operate continuously. Its CMR recording technology and OptiNAND architecture support heavy, always-on workloads in professional surveillance environments.

550TB yearly workload rating

This single specification defines whether the drive matches the installation: it is rated for up to 550TB of data written per year, far above desktop-class drives, and is optimised to handle up to 64 single-stream HD cameras plus multi-stream smart cameras without frame loss.

24/7 thermal and acoustic profile

Engineered for non-stop operation with an MTBF of up to 2.5 million hours, the 7200 RPM spindle and AllFrame AI streaming technology maintain consistent throughput while managing heat and vibration in multi-drive chassis. Power draw follows standard SATA 6.0Gb/s limits for the form factor.

How it compares

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

Price $821.99
Pricier than about 90% of the 4,938 comparable items (median $107.99).
Total capacity 22 TB
Higher than about 95% of the 2,372 comparable items (median 2 TB).
Price per TB $37.36 per TB
Cheaper than about 73% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product linePurple Pro
Model nameWD221PURP
Total capacity22 TB
Recommended useFor Video Surveillance
Performance
Rotational speed7,200 RPM
Storage
Recording methodCMR
Cache memory512 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 weight0.66 kg
Package size142 × 102 × 25 mm

Other versions of this model

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Questions about this item

How much video data can the 22TB capacity actually store in a 24/7 surveillance system?

The 22TB capacity supports a workload rating up to 550TB per year, allowing continuous capture and analysis from multiple high-resolution camera streams.

What does the SATA 6.0Gb/s interface limit in a real recorder or server?

The SATA 6.0Gb/s interface caps the maximum theoretical transfer rate at 6.0Gb/s, which is the standard ceiling for mechanical drives in surveillance appliances.

Will the 3.5" form factor with 26.10mm height fit my NVR drive bay?

The drive measures 147.00mm long, 101.60mm wide and 26.10mm high, matching the standard 3.5" internal bay dimensions used in most NVRs and servers.

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