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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

  • InterfaceSATA 6.0Gb/s
  • Capacity12TB
  • NAND Flash Memory TypeHard Drive
  • Recording TechnologyCMR
  • RPM7200 RPM
  • Cache512MB

Capacity 12TB

Show 4 more configurations
  • 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.

Highlights

  • 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

Specifications

BrandWD
SeriesRed Pro
ModelWD122KFBX
InterfaceSATA 6.0Gb/s
Capacity12TB
NAND Flash Memory TypeHard Drive
Recording TechnologyCMR
RPM7200 RPM
Cache512MB
FeaturesOptimized for NAS with NASware™
Western Digital’s exclusive NASware™ technology fine tunes drive parameters to match NAS system workloads, which helps increase performance and reliability.
Designed for Continuous Operation
WD Red Pro hard drives are designed to handle the rigorous demands of high-intensity 24x7 multi-user NAS environments and increase system durability.
Tested for Dependable Compatibility
Western Digital partners with a wide range of NAS system vendors for extensive testing to ensure compatibility with most NAS enclosures.
Protected against Excessive Vibration
WD Red
UsageEnterprise NAS Hard Drives
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Shipping weight0.84 kg
Package size191 × 127 × 64 mm

Other versions of this model

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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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