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WD Red Pro 12TB 3.5in 7200RPM SATA NAS Hard Drive HDD [WD121KFBX]

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WD Red Pro 12TB 3.5in 7200RPM SATA NAS Hard Drive HDD [WD121KFBX]

  • Exclusive NASware 3.0 Technology
  • Built for Optimum NAS Compatibility
  • Larger NAS Bay Shock Protection
  • 3D Active Balance Plus
  • Error Recovery Prevention
  • Extended Drive Testing


Exclusive NASware 3.0 Technology

Our exclusive advanced firmware technology, NASware 3.0, enables seamless integration, robust data protection and optimal performance for NAS systems operating under heavy demand. Built into every WD Red Pro hard drive, NASware 3.0’s advanced technology improves storage performance by increasing compatibility, integration, upgradeability, and reliability.

Built for Optimum NAS Compatibility

WD Red Pro drives with NASware technology takes the guesswork out of selecting a drive. Optimized for NAS systems, our unique algorithm balances performance and reliability in NAS and RAID environments. Simply put, a WD Red Pro drive is one of the most compatible drives available for NAS enclosures. But don’t take our word for it. WD Red Pro drives are a reflection of extensive NAS partner technology engagement and compatibility-testing.

Larger NAS Bay Shock Protection

WD Red Pro drives are equipped with a multi-axis shock sensor that automatically detects subtle shock events and dynamic fly height technology which adjusts each read-write function to compensate and protect the data. This combination of technology further protects the drives in larger 24-bay NAS environments and helps increase hard drive reliability.

3D Active Balance Plus

Our enhanced dual-plane balance control technology significantly improves the overall drive performance and reliability. Hard drives that are not properly balanced may cause excessive vibration and noise in a multi-drive system, reduce the hard drive life span, and degrade the performance over time.

Error Recovery Prevention

Built specifically for RAID and NAS environments, WD Red Pro drives come equipped with error recovery controls as part of NASware 3.0 technology to help reduce drive fallout in RAID applications.

Extended Drive Testing

A NAS environment that has up to 24 bays is very demanding on a hard drive with added vibration and heat. This is why every WD Red Pro drive is shipped with extended thermal cycle burn-in testing to help ensure each drive is tested for extended reliable operation.

Longer Warranty Coverage

WD Red Pro drives comes with a 5-year limited warranty for an even greater peace of mind.

Desktop drives vs. WD Red Pro

Do right by your NAS and choose the drive purpose-built for NAS with an array of features to help preserve your data and maintain optimum performance. Take the following into consideration when choosing a hard drive for your NAS

More Information
Model WD121KFBX
Condition New
Product Type NAS
Capacity 12TB

Full Specifications


12 TB

Cache Size

256 MB

Disk Speed (RPM)




Transfer Rate

up to 240MB/s


Designed with CMR technology for medium or large-sized businesses in RAID-optimized NAS
systems with up to 24 bays. Perfect for archiving, sharing and handling high-intensity workloads.

Recording Technology


Dimensions (L x W x H)

147mm x 101.6mm x 26.1mm

Warranty 5 Year Warranty

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