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Silver 3.5-inch internal hard drive with label showing Red Pro 18TB branding

Western Digital

Western Digital WD181KFGXProduct Red Pro 18TB 7200 RPM 3.5" SATA internal hard drive

SKU CH-ECAK-84BZD MPN WD181KFGXProduct

An 18 TB 3.5-inch SATA hard drive spinning at 7200 RPM with a 512 MB cache and CMR technology, built for NAS systems with up to 24 bays

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Rotational speed7,200 RPM
  • Cache memory512 MB
  • Recording methodCMR
  • 18 TB capacity for large NAS storage
  • 7200 RPM speed for fast data access
  • CMR technology for consistent write performance
  • Helium-sealed design with vibration sensors for 24-bay reliability
  • 512 MB cache with SATA 6.0 Gb/s interface

18 TB Red Pro NAS Drive

The Western Digital Red Pro WD181KFGX is an 18 TB 3.5-inch internal hard drive built for network-attached storage. It spins at 7200 RPM over a SATA 6.0 Gb/s interface and uses conventional magnetic recording with a 512 MB cache. A helium-sealed design and rotational vibration sensors support reliable operation in multi-bay enclosures.

Suited for 24-bay NAS workloads

This drive targets power users and medium-sized businesses running 24x7 NAS systems with up to 24 bays. It handles high-intensity workloads such as archiving, file sharing and backup for many concurrent users. Buyers who need a smaller capacity or a lower-RPM drive for lighter desktop use should consider other models.

CMR recording with helium sealing

The single specification that decides fit is the conventional magnetic recording method combined with a helium-sealed chassis. CMR delivers consistent write performance without the latency penalties of shingled recording, while the helium fill reduces turbulence and power draw at 7200 RPM. This combination makes the drive appropriate for heavy, always-on NAS arrays.

How it compares

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

Price $412.99
Pricier than about 90% 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 $22.94 per TB
Cheaper than about 91% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Product lineRed Pro
Model nameWD181KFGX
Part numberWD181KFGX
Total capacity18 TB
Performance
Rotational speed7,200 RPM
Storage
Cache memory512 MB
Recording methodCMR
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)

Questions about this item

What does the 18TB capacity mean for a NAS with many users?

The 18TB capacity lets a multi-bay NAS store very large shared libraries, backups and archives so many users can access data without running out of space.

What does the SATA 6.0Gb/s interface limit in practice?

The SATA 6.0Gb/s link sets the maximum data rate between the drive and the NAS controller, so sustained transfers cannot exceed the interface bandwidth.

Will this 3.5-inch drive fit a standard NAS tray?

The 3.5-inch form factor matches standard NAS drive trays and desktop bays, so it mounts directly without adapters.

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