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Silver 3.5 inch internal hard drive with green label

Western Digital

Western Digital WD40EFPX 4TB 3.5" 5400 RPM 256MB CMR SATA internal hard drive

SKU CH-SAPA-CYYHA MPN WD40EFPX

4TB 3.5" CMR drive built for 24/7 NAS workloads up to 180 TB/yr with 256MB cache

  • InterfaceSATA 6.0Gb/s
  • Capacity4TB
  • NAND Flash Memory TypeHard Drive
  • Recording TechnologyCMR
  • RPM5400 RPM
  • Cache256MB
  • 4TB capacity stores large media libraries and backups
  • CMR technology delivers consistent write performance for RAID arrays
  • 256MB cache accelerates frequent read and write operations
  • NASware firmware optimises drive behaviour for 24/7 NAS workloads
  • 180 TB/yr workload rating supports heavy multi-user environments

Purpose-built NAS storage

The WD Red Plus WD40EFPX is a 4TB 3.5-inch hard drive designed for small to medium business NAS systems that operate continuously. Its CMR recording technology and 256MB cache support multi-bay enclosures up to eight drives, delivering the capacity and reliability needed for always-on data protection and sharing.

SATA integration for RAID arrays

The drive connects through a SATA 6.0Gb/s interface and fits standard 3.5-inch bays with maximum dimensions of 147.00mm length, 101.60mm width and 26.10mm height. NASware™ firmware tunes drive parameters for RAID-optimised workloads, while extensive vendor testing ensures compatibility across most NAS enclosures without requiring additional configuration.

Efficient 24/7 operation

Engineered for a 180 TB/yr workload rate, the 5400 RPM spindle speed helps reduce power consumption and heat output compared with previous models. Lower operating temperatures contribute to quieter performance in thermally constrained chassis, supporting dependable long-term operation in systems that run 24 hours a day.

Punti di forza

  • 4TB capacity stores large media libraries and backups
  • CMR technology delivers consistent write performance for RAID arrays
  • 256MB cache accelerates frequent read and write operations
  • NASware firmware optimises drive behaviour for 24/7 NAS workloads
  • 180 TB/yr workload rating supports heavy multi-user environments

Caratteristiche tecniche

BrandWD
SeriesRed Plus
ModelWD40EFPX
InterfaceSATA 6.0Gb/s
Capacity4TB
NAND Flash Memory TypeHard Drive
Recording TechnologyCMR
RPM5400 RPM
Cache256MB
FeaturesTackle Intensity with WD Red® Plus
Packed with power to handle NAS environments in home offices up to medium-sized businesses, WD Red Plus is ideal for helping protect, archive, and share valuable data in NAS systems with up to 8 bays. WD Red Plus NAS drives give you the flexibility, versatility, and confidence you need for your important home and work files.
For Small or Medium Businesses
WD Red® Plus drives deliver the speed and capacity business customers require to store, protect, and share increasing amounts of data with a growing number of NAS users. For NAS systems with up to
UsageFor NAS systems
Form Factor3.5"
Height (maximum)26.10mm
Width (maximum)101.60mm
Length (maximum)147.00mm
Peso di spedizione0.54 kg
Dimensioni del pacco146 × 102 × 25 mm

Domande su questo articolo

What workload rate can the WD40EFPX sustain in a NAS before hitting its annual limit?

The drive is rated for up to 180 TB per year, which is the workload ceiling Western Digital specifies for this model in multi-bay NAS enclosures.

How much heat and noise should I expect when the drive runs 24/7 in a small NAS?

WD Red Plus drives are engineered to use less power and run cooler than prior models, reducing heat buildup and acoustic output during continuous operation.

Which NAS enclosures is this 3.5-inch SATA drive compatible with?

Western Digital tests the drive with a wide range of NAS vendors to ensure compatibility with most multi-bay enclosures that accept 3.5-inch SATA drives.

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