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

Western Digital

Western Digital WD181KFGX 18TB 7200 RPM 512MB CMR 3.5" internal hard drive

SKU CH-G3GA-RA72F MPN WD181KFGX

An 18 TB enterprise NAS drive with 7200 RPM, 512 MB cache and CMR recording for up to 24-bay systems

  • Total capacity18 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Recording methodCMR
  • Rotational speed7,200 RPM

Capacity 18TB

Show 4 more
  • 18TB capacity for large-scale NAS storage
  • 7200 RPM and 512MB cache deliver fast data access
  • CMR recording technology ensures consistent write performance
  • 3D Active Balance Plus reduces vibration in multi-bay enclosures
  • Rated for 300TB per year workload in 24-bay systems

18TB CMR NAS drive

The Western Digital WD181KFGX is an 18TB 3.5 inch internal hard drive built for multi-bay NAS enclosures. It uses CMR recording technology, spins at 7200 RPM and provides a 512MB cache over a SATA 6.0Gb/s interface. The drive belongs to the Red Pro series designed for continuous operation.

Suited for 24-bay RAID arrays

This drive supports NAS systems with up to 24 bays and a 300TB per year workload rate. NASware 3.0 technology and 3D Active Balance Plus enhance reliability in vibration-prone chassis. Builders needing more than 24 bays or a non-SATA interface should consider other solutions.

18TB capacity decision

The single specification that determines fit is the 18TB capacity. Verify that the NAS bay count, RAID level and total storage target align with this capacity before purchasing.

How it compares

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

Price $561.99
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 $31.22 per TB
Cheaper than about 81% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineRed Pro
Model nameWD181KFGX
Total capacity18 TB
Recommended useEnterprise NAS Hard Drives
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeHard Drive
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 weight0.82 kg
Package size216 × 152 × 76 mm

Other versions of this model

5 more in the same range

Questions about this item

How much power does the 18TB 7200 RPM drive draw during continuous all-day operation?

The drive is rated for a 300TB yearly workload and uses 3D Active Balance Plus to reduce vibration, but exact power-draw figures are not supplied.

What host interface and bay size must my NAS already provide for this 3.5" SATA 6.0Gb/s drive?

A free 3.5-inch bay with a SATA 6.0Gb/s port and standard SATA power connector is required.

Will this 18TB CMR drive work reliably in a four-bay NAS that currently runs older 4TB drives?

Yes, the drive supports up to 24 bays and NASware 3.0 optimises it for mixed-capacity RAID arrays.

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