Western Digital WD40EFPX 4TB 3.5" LFF 6Gbps WD Red NAS Drive

Western Digital Part #/MPN: WD40EFPX

DiscTech Item #: WDC-WD40EFPX-BN-3Y


Enterprise Grade

Capacity: 4TB

Speed: 5,400RPM

Interface Types: SATA

Form Factor: 3.5inx1.0in LFF Hard Drive

Sector Size: 512 / 512e

Sustained Throughput: 185

Electrical Interface: SATA 600 - 6.0Gbps

On-Board Cache: 256MB

Western Digital WD40EFPX 4TB 3.5" LFF 6Gbps WD Red Plus NAS SATA Hard Drive - Brand New

Western Digital WD40EFPX 4TB 3.5" LFF 6Gbps WD Red Plus NAS SATA Hard Drive - Brand New

Powerful hard drives designed for performance, reliability and power efficiency.
WD Red® Plus drives are designed to handle workloads of power users and small to medium business NAS environments. WD Red Plus drives deliver the speed and capacity required to store, protect and share growing amounts of data in mid-sized RAID-optimized NAS systems with increased power efficiency.

Tuned 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
Since your NAS system is always on, a reliable drive is essential. WD Red Plus hard drives are designed for systems that operate 24x7, giving users the confidence of knowing they can reliably access their data.

Tested for Dependable Compatibility
Western Digital partners with a wide range of NAS system vendors forextensive testing to ensure compatibility with most NAS enclosures.

Optimized for Lower TCO
WD Red Plus drives are engineered to use less power (versus previous models) and run cooler, which reduces operating costs and helps reduce heat in thermally challenged NAS boxes.

Powered for Strong Performance
Despite using less power, the drives have plenty of bandwidth to handle the mixed performance demands of multi-drive NAS systems.

Balanced for Increased Reliability
Hard drives that are not properly balanced may cause excessive vibration and noise in multi-drive systems, which could reduce hard drive life span and degrade the performance over time. Our enhanced dual-plane balance control technology significantly improves balance and increases overall drive performance and reliability.

Backed by World-Class Support and Warranty
As an industry-leading hard drive manufacturer, Western Digital stands behind their NAS storage solutions with the assurance of a 3-year limited warranty and world-class support services for hassle free data storage.

Product Highlights

  • Available in capacities ranging from 2TB to 12TB
  • For RAID-optimized NAS systems with up to 8 bays
  • Rated for 180TB/year workload and 1M hours MTBF

Ideal For:

  • Home Offices and Power Users
  • Small to Medium Businesses
  • Consumer and Commercial NAS systems


This drive is compatible with any server or storage array that accepts 3.5in x 1.0in (LFF) SATA drives.

WD Red Plus NAS Storage
Model NumberWD40EFPX
Recording TechonlogyCMR
InterfaceSATA 6Gb/s
Formated Capacity4TB / 4000GB
Form Factor3.5-inch
Advanced Format (AF)Yes
Native Command QueuingYes
RoHS compliantYes
Data Transfer Rate Max
Interface Speed6 Gb/s
Internal Transfer Rate185 MB/s
Cache (MB)256
Performance RPM Class5400 RPM Class
Reliability/Data Integrity
Load/unload cycles600,000
Non-recoverable read errors per bits read<1 in 1014
MTBF (hours)1,000,000
Workload Rate180
Power Management
12VDC ±5% (A, peak)1.75
Average Power Requirements (W)
Environmental Specifications
Temperature (°C)
Operating0 to 65
Non-operating-40 to 70
Shock (Gs)
Operating (2 ms, read/write)70
Operating (2 ms, read)70
Non-operating (2 ms)250
Acoustics (dBA)
Seek (average)27
Physical Dimensions
Height (in/mm)1.028/26.1
Length (in/mm)5.787/147
Width (in/mm, ± .01 in)4/101.6
Weight (lb/kg, ± 3%)1.26/0.57

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ROHS Compliant

Weight: 1.8 lb

Warranty: 3 Year Manufacturer

Brand New

Condition Levels Explained

The product is brand new.

3 Year Manufacturer Warranty

Product Warranties Explained

The product has a manufacturer warranty for the time period specified.