Western Digital Red Pro - 22TB 7200RPM 4Kn SATA III 6Gb/s 512MB Cache 3.5" NAS Network Hard Drive - WD221KFGX


Warranty5 Year Manufacturer
AvailabilityIn Stock
ManufacturerWestern Digital Corporation
SeriesWD Red Pro NAS Hard Drive
UPC Code718037893501

Product Specs

Product Specs
Capacity22 TB
Spindle Speed7200 RPM Fluid Dynamic Bearing (FDB) Motor
Cache Buffer512 MB CacheFlow Disk Caching
Advanced FormatYes - 512e (emulation) 4096 (4Kn native) Logical Data Block Length
Form Factor3.5 Inch Internal Hard Drive
InterfaceSATA III 6Gb/sec (Generation 3)
Interface Speed6Gb/sec - Data Transfer Rate (max) Buffer to Host
Data Transfer Rateup to 265MB/sec Host to/from Drive (Sustained)
Interface ConnectorSATA (7-Pin Signal and 15-Pin Power Connector)
Recording TechnologyConventional Magnetic Recording (CMR) Technology
Life Expectancy1,000,000 Hours MTBF (Mean Time Before Failures)
Workload Rating300 TB/yr (Workload Rate Limit) / 600,000 (Load/Unload Cycles)
Shock ResistanceOperating: 40Gs write (2ms) / 40Gs read (2ms) - Non Operating: 200Gs (2ms)
EncryptionNo - Standard Model
Rohs CompliantYes
Dimensions(L x W x H) 5.787 in. x 4.0 in. x 1.028 in.
ClassificationNAS Network Drives

Key Features

  • Capacity's up to 22TB
  • Built to run in 24/7 (always-on) Environments
  • Equipped with a Multi-Axis Shock Sensor
  • MTBF of up to 1 Million Hours
  • Workload Rating of 300TB per Year
  • NASware 3.0 Technology
  • Error Recovery Prevention Technology
  • Enhanced 3D Dual-Plane Balance Control Technology
  • Native Command Queuing Technology
  • Magnetic (CMR) Recording Technology
  • Dynamic Fly Height Control Technology
  • WD's CacheFlow Disk Caching Technology
  • WD's IntelliSeek Technology
  • Pre-emptive Wear Leveling (PWL) Technology
  • NoTouch Ramp Load Technology
  • Triple Stage Actuator Technology
  • Two Demesional Magnetic Recording Technology
  • Energy-assisted PMR (ePMR) Technology
  • Rotational Vibration Safegaurd (RSV) Technology
  • Fluid Dynamic Bearing (FDB) Motors

WD Red Pro NAS Hard Drives

  • Take Control of Rapidly Growing Data - Built for power users and medium-sized businesses struggling to manage rapidly growing amounts of data, WD Red Pro drives are specifically designed for NAS systems with up to 24 bays. Engineered to handle high-intensity workloads in 24x7 environments, WD Red Pro is ideal for archiving, protecting, and sharing data with a large number of users or multiple data-hungry applications. These drives add value to your business by enabling your employees to quickly share files, back up folders, and access data quickly and reliably in your NAS system.
  • 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 take 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 system 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.
  • Boost Your NAS - WD Red drives are available in capacities up to 22TB utilizing the OptiNAND technology’s capacity-enabling feature.

Desktop Drives vs. WD Red Pro

It is important to choose a drive purpose-built for NAS with the features you need to help preserve your data and maintain optimum performance. Take the following into consideration when choosing a hard drive for your NAS:

  • Compatibility: Unlike desktop drives, these drives are specifically tested for compatibility with NAS systems for optimum performance.
  • Reliability: Desktop drives aren’t typically designed for the demands of an always-on NAS environment. WD Red Pro NAS hard drives are tested under tough conditions like you might experience in your environment.
  • Error Recovery Controls: WD Red Pro NAS hard drives are specifically designed with RAID error recovery control to help  educe failures within the NAS system.
  • Noise and Vibration Protection: Designed to operate solo, desktop drives typically offer little or no protection from the noise and vibration present in a multi-drive system. WD Red Pro drives are designed to thrive in multi-bay NAS system environments.
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