Western Digital Red Pro WD4001FFSX 4TB 3.5" SATA 6.0Gb / s NAS Hard Drive

  Western Digital Red Pro WD4001FFSX 4TB 3.5" SATA 6.0Gb / s NAS Hard Drive
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  • $219.90
  • $249.99
  • $30.09
  • $7.66

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Western Digital Red Pro WD4001FFSX Hard Drive, 3.5" Form Factor, 4TB (4000GB) Capacity, 64MB Cache, SATA 6.0 Gb/s Interface, 7200 RPM Rotational Speed, 1,200,000 hours MTBF, Storage for 8 to 16 bay NAS Solutions.





WD Red Pro


Storage for 8 to 16 bay NAS solutions

Joining the original color of NAS, WD Red Pro continues the formula of success that has led the WD Red product family by adding support beyond consumer, SOHO, and small business markets into medium and large 8-16 bay business storage systems. WD Red Pro hard drives integrate WD's exclusive technology, NASware 3.0, to provide unparalleled support for drive compatibility, reliability, and performance.


NASware grows to 3.0

Designed specifically with SMB customers in mind the WD Red family has expanded with the addition of WD Red Pro, which is available for the 8 to 16 bay medium to large-scale NAS environments. With capacities up to 4 TB, WD Red Pro carries a 5-year limited warranty and was engineered to handle the increased workloads from your business.


Experienced in NAS

WD Red is a reflection of the most extensive NAS partner compatibility- testing list that is available on the market.* That means when you buy a NAS enclosure, you can trust that WD Red will be the most compatible drive available. Our pride is in our product and our vision is shared with our customers.

*Data reflects products in production as of July 2014.

NAS for Big Business

Increase the efficiency and productivity of your business with WD Red Pro hard drives for your 8 to 16 bay NAS system. WD Red Pro comes equipped with NASware 3.0, which increases system compatibility allowing for seamless integration with your existing network infrastructure. Add value to your business by enabling your employees to quickly share their files and back up folders reliably with WD Red Pro NAS hard drives in your NAS solution.




8 to 16 Bay Shock Protection

WD Red Pro is 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 large 8 to 16 bay NAS environments and increases drive reliability.




Vibration Protection

In combination with 3D Active BalanceTM Plus, WD Red Pro also features hardware vibration compensation technology which monitors the drive to correct both linear and rotational vibration in real time, further increasing drive reliability.


Enhanced Accuracy for NAS

For overall enhanced accuracy for NAS, WD Red Pro is also equipped with dual actuator technology which improves positional accuracy over the data tracks and head positioning. StableTracTM technology then secures the motor shaft at both ends to reduce system-induced vibration and stabilize the drive platters for accurate tracking during read and write operations. Both technologies are important for larger 8 to 16 bay NAS environments.


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.

Extended Drive Testing

The 8 to 16 bay NAS environment is very demanding on a hard drive with added vibration, heat and other factors. This is why every WD Red Pro drive is shipped with extended thermal cycle burn-in testing which ensure each drive for extended reliable operation.


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, which prevents the drive from fallout in RAID applications.


Longer Warranty Coverage

Complimenting WD Red at a 3-year limited warranty, WD Red Pro offers longer warranty coverage with a 5-year limited warranty for an even greater peace of mind.


NAS Compatibility

Since your NAS system is always on, a highly reliable drive is essential. With a 35% MTBF improvement over standard drives, the WD Red drive with NASware 3.0 is designed for the 24x7 environment.


Ideal for:

Specifically designed and tested for medium to large business NAS applications with 8 - 16 bays.

For systems that use less than 8 bays, please consider WD Red hard drives.*


Need Help? We offer Premium Support.

Every WD Red hard drive comes with our world-class professional support services including a premium dedicated 24/7 support line (available in English, other regional support hours vary) and a 5-year limited warranty.






NASware grows to 3.0

Built off of our determination to deliver the best NAS experience, NASware 3.0 extends our promise by further optimizing WD Red for the NAS environment with added support for 6 to 8 NAS bays. WD Red now supports small NAS systems from 1 to 8 bays thanks to NASware 3.0, which further improves drive compatibility and reliability. At 48 TB of total capacity in an 8 bay system, WD Red really is a newer generation NAS experience.



WD's exclusive NASware technology, built into every WD Red hard drive.

WD's exclusive NASware technology, built into every WD Red hard drive, improves NAS storage performance by reducing common hard drive concerns in NAS systems including concerns for things like compatibility, integration, upgradeability, reliability and cost of ownership that are experienced with a hard drive designed for desktop computers.



Desktop hard drives are designed for desktop computers.

Desktop hard drive are designed for optimum performance and reliability in a desktop personal computer. Although they are an affordable alternative to enterprise-class drives, desktop drives have a higher level of risk for potential data loss and failure in an always-on RAID configured NAS system. Specific issues that you may experience using desktop drives in a NAS or RAID environment include:


  • Compatibility: Desktop hard drives are not always tested for compatibility in NAS and can present problems during integration.


  • Reliability: Most desktop drives are not designed for the high operating temperatures or for 24x7 operating environments making them less reliable when used in a NAS system.


  • Error recovery controls: Desktop drives are not traditionally designed for RAID environments and have controls that prevent the RAID controller from assisting in the event of an error which can cause the hard drive to drop off the RAID after a period of time. Rebuilding a RAID often requires several hours and can have a significant impact on downtime and productivity.


  • Noise and vibration: Typically designed for single drive applications, average desktop drives are not optimized for multi-drive systems which have higher noise and vibration levels. When these drives are added to a NAS, the additional vibration can reduce the reliability and life span of the drive.




Beyond desktop with NASware

WD Red drives include WD's exclusive NASware technology that addresses many of the challenges a traditional desktop hard drive has in a NAS system. WD works directly with our partners to test compatibility and reduce our customer's guess work as to which drive is right for their NAS system. Designed to deliver a better customer experience in small NAS systems, this innovative firmware finely balances the most important attributes of performance, power, and reliability in multiple drive environments. The unique algorithms in NASware optimize power and performance without compromising on the attributes that NAS-system owners value.


Save power and money

NASware optimizes power use resulting in significant power savings and lower hard drive operating temperatures. This improves the overall reliability and performance of the drive and reduces the NAS cost of ownership.


Intelligent error recovery

With built in intelligent error recovery controls, NASware also prevents hard drives from being dropped off the RAID due to extended error recovery. This provides more availability and less down time rebuilding the RAID.


Command completion

To further improve reliability, NASware minimizes the data corruption or loss in the event of an unexpected power loss by completing the command in process before shutting down.


BrandWestern Digital
SeriesWD Red Pro
HighlightsWestern Digital Red Pro WD4001FFSX Hard Drive, 3.5" Form Factor, 4TB (4000GB) Capacity, 64MB Cache, SATA 6.0 Gb/s Interface, 7200 RPM Rotational Speed, 1,200,000 hours MTBF, Storage for 8 to 16 bay NAS Solutions.
Rotational Speed7,200 RPM (nominal)
Buffer Size64 MB
Load/unload Cycles600,000 minimum
Target PerformanceMTBF for 1-5 Bay NAS: 1,200,000 hours
Transfer Rates
Buffer To Host (Serial ATA)6 Gb/s (Max)
Physical Specifications
Capacity4 TB
Form Factor3.5 Inch
Physical Dimensions
Height1.028 Inches
Depth5.787 Inches
Width4.00 Inches
Weight1.66 Pounds
Environmental Specifications
ShockOperating Shock (Read) : 65G, 2 ms
Non-operating Shock : 300G, 2 ms
AcousticsIdle Mode : 31 dBA (average)
Seek Mode 0 : 34 dBA (average)
TemperatureOperating : 41° F to 140° F
Non-operating : -40° F to 158° F
Electrical Specifications
Power DissipationRead/Write: 8.60 Watts
Idle: 6.50 Watts
Standby: 0.60 Watts
Sleep: 0.60 Watts
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