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Silver rectangular 3.5-inch internal hard drive with silver label and circuit board visible

Western Digital

Western Digital WD120EFBX 12TB 3.5" 7200 RPM 256MB CMR SATA internal hard drive

SKU CH-0CWW-09WN9 MPN WD120EFBX

A 12TB 3.5" CMR hard drive spinning at 7200 RPM with 256MB cache, built for 24/7 NAS workloads up to 180 TB/yr

  • Total capacity12 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drives
  • Recording methodCMR
  • Rotational speed7,200 RPM
  • 12TB capacity stores large media libraries and backups
  • CMR recording technology sustains consistent write performance
  • 7200 RPM spindle speed delivers fast data access
  • NASware firmware optimises compatibility with multi-bay NAS systems
  • 180 TB/yr workload rating supports 24×7 small-business operation

WD Red Plus 12TB NAS drive

The WD Red Plus WD120EFBX is a 12TB 3.5-inch internal hard drive built for small to medium business NAS systems. It uses conventional magnetic recording (CMR) and spins at 7200 RPM with a 256MB cache. Designed for always-on environments, it supports workloads up to 180 TB per year and fits NAS enclosures with up to eight drive bays. Its NASware firmware tunes drive behaviour for RAID arrays and continuous operation.

SATA 6.0Gb/s interface

The drive connects through a SATA 6.0Gb/s interface, which is the single specification that determines host compatibility. It fits any 3.5-inch bay with a standard SATA data and power connector. The physical dimensions are 147.00mm long, 101.60mm wide and 26.10mm high. No other interface or protocol is supported, so the host must provide a native SATA port or a compatible controller.

Thermals and power in normal use

Engineered for 24x7 operation, the drive balances performance with power conservation in multi-bay NAS chassis. NASware firmware optimises seek and idle behaviour to reduce heat output and acoustic noise during sustained workloads. The 7200 RPM spindle speed delivers responsive throughput while the firmware manages power states for efficient operation in enclosed, fan-cooled environments.

How it compares

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

Price $268.99
Pricier than about 79% of the 4,938 comparable items (median $107.99).
Total capacity 12 TB
Higher than about 90% of the 2,372 comparable items (median 2 TB).
Price per TB $22.42 per TB
Cheaper than about 91% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineRed Plus
Model nameWD120EFBX
Total capacity12 TB
Recommended useFor NAS systems
Performance
Rotational speed7,200 RPM
Storage
Flash memory typeHard Drives
Recording methodCMR
Cache memory256 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 weight0.91 kg
Package size229 × 152 × 76 mm

Questions about this item

How much data can the 12TB capacity actually hold in a typical NAS?

The 12TB drive provides 12 terabytes of raw storage for files, backups, and media in a NAS array.

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

The SATA 6.0Gb/s link caps sequential transfer at the interface speed; sustained rates depend on the 7200 RPM platters and 256MB cache.

Will the 3.5-inch dimensions fit my NAS bay?

The drive measures 147.00mm long, 101.60mm wide, and 26.10mm high, matching standard 3.5-inch NAS drive bays.

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