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

Western Digital

Western Digital WD122KFBX Red Pro 12TB 7200 RPM 512MB SATA 3.5" internal hard drive

SKU CH-ZV5M-SJ6ZY MPN WD122KFBX

12 TB 7200 RPM CMR drive with 512 MB cache built for 24-bay NAS workloads

  • Total capacity12 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Flash memory typeHard Drive
  • Recording methodCMR
  • Rotational speed7,200 RPM

Capacity 12TB

Show 4 more
  • Built for 24-bay enterprise NAS with 12TB capacity
  • 7200 RPM speed and 512MB cache accelerate RAID workloads
  • CMR recording technology ensures consistent write performance
  • NASware 3.0 optimises drive parameters for multi-user environments
  • 300TB per year workload rating supports continuous operation

Capacity and workload rating

The Western Digital WD122KFBX Red Pro is a 12TB 3.5-inch internal hard drive built for 24/7 multi-user NAS environments. It uses CMR recording technology at 7200 RPM with a 512MB cache and a SATA 6.0Gb/s interface. The drive supports workloads up to 300TB per year and is validated for systems with up to 24 bays.

Upgrade path for growing NAS arrays

This drive replaces lower-capacity or desktop-class drives when storage demands exceed what consumer models can sustain. The jump is worth it when your array requires the 300TB annual workload rating, NASware 3.0 optimisation, and vibration protection for multi-bay enclosures. It is not suited for single-drive desktop use or workloads below the rated threshold.

Sustained operation under load

Under continuous operation the drive maintains performance through 3D Active Balance Plus technology and error recovery controls tuned by NASware 3.0. Extended factory testing verifies reliability for round-the-clock RAID workloads. The 512MB cache helps absorb write bursts while the 7200 RPM spindle delivers consistent throughput for multi-user access.

How it compares

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

Price $448.99
Pricier than about 90% 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 $37.42 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 lineRed Pro
Model nameWD122KFBX
Total capacity12 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 weight0.84 kg
Package size191 × 127 × 64 mm

Other versions of this model

5 more in the same range

Questions about this item

Will the 26.10 mm height fit my 3.5-inch drive bay?

The drive measures 26.10 mm tall, 101.60 mm wide and 147.00 mm long, matching the standard 3.5-inch form factor used in most desktop and NAS chassis.

Which SATA cable and power connector do I need for the 6.0 Gb/s interface?

Connect a standard SATA data cable to the 6.0 Gb/s port and a 15-pin SATA power plug; the common mistake is seating the data connector loosely, which drops the link to 3.0 Gb/s.

When should I plan to replace a drive rated for 300 TB per year?

With a 300 TB annual workload rating and 512 MB cache, monitor SMART reallocated-sector counts; replace the unit once the workload counter approaches the rated limit or errors rise.

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