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Silver 3.5 inch bare hard drive with exposed circuit board and SATA connectors

Western Digital

Western Digital WD40EFRX 4TB 5400 RPM 64MB 3.5" SATA internal hard drive

SKU CH-RM5C-R8CFP MPN WD40EFRX

A 4 TB 3.5" SATA drive built for 24/7 NAS use with 64 MB cache and 180 TB/yr workload rating

  • Total capacity4 TB
  • Interface typeSATA 6.0Gb/s
  • Form factor3.5 in (8.89 cm)
  • Packaging typeBare Drive
  • Rotational speed5,400 RPM
  • Cache memory64 MB
  • Designed for always-on NAS with 24×7 operation rating
  • CMR technology and 64MB cache keep data flowing steadily
  • NASware firmware tunes compatibility for up to 8-bay enclosures
  • 180 TB/yr workload rate handles heavy multi-user traffic
  • 4TB capacity in a standard 3.5″ SATA form factor

4 TB NAS Drive for Small Arrays

The Western Digital Red Plus WD40EFRX is a 4 TB 3.5 inch internal hard drive built for network-attached storage. It uses a SATA 6.0 Gb/s interface and conventional magnetic recording. The drive is rated for 180 TB per year workload and supports systems with up to 8 bays.

5400 RPM Thermals and Power Profile

Operating at a 5400 RPM performance class with 64 MB cache, the drive runs cooler and quieter than faster desktop disks. The lower spindle speed reduces vibration in multi-bay chassis. NASware firmware manages power states for continuous 24 hour operation in small or medium business environments.

Fits Standard 3.5 Inch Bays

The bare drive measures 147.00 mm long, 101.60 mm wide and 26.10 mm high, matching standard 3.5 inch mounting points. It requires a SATA data cable and a SATA power connector from the host. No extra cooling hardware is mandated by the drive design. Builders needing more than 8 bays or higher sustained write bandwidth should consider other solutions.

How it compares

Measured against everything we stock in 3.5-Inch Internal Desktop HDDs, at today’s prices. Recalculated every night.

Price $128.99
Pricier than about 55% of the 4,938 comparable items (median $107.99).
Total capacity 4 TB
Higher than about 70% of the 2,372 comparable items (median 2 TB).
Price per TB $32.25 per TB
Cheaper than about 80% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWD
Product lineRed Plus
Model nameWD40EFRX
Total capacity4 TB
Recommended useFor NAS systems
Performance
Rotational speed5,400 RPM
Storage
Cache memory64 MB
Ports & slots
Interface typeSATA 6.0Gb/s
Size & build
Form factor3.5 in (8.89 cm)
Max height26.1 mm
Maximum width101.6 mm
Maximum length147 mm
Shipping weight0.77 kg
Package size222 × 159 × 76 mm

Questions about this item

How do I install the WD40EFRX in a NAS bay, and what step is often missed?

Slide the 3.5-inch drive into the bay, secure it with four screws, connect the SATA 6.0Gb/s data and power cables, then use the NAS operating system to create a volume before storing data.

What maintenance or replacement should I plan for with this drive?

The drive is rated for 180 TB per year workload; monitor SMART attributes and replace the unit once reallocated sectors appear or the annual write volume approaches the rated limit.

What limit appears first during sustained 24x7 writes on this model?

The 5400 RPM rotational speed and 64MB cache set the sustained throughput ceiling, so the write-speed plateau is reached before the 180 TB yearly workload rating.

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