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Silver 3.5 inch SATA hard drive with green label

Western Digital

Western Digital WD40EFZZ 4TB 3.5" 5400RPM SATA internal hard drive

SKU CH-9DRF-NTPV1 MPN WD40EFZZ

A 4TB 3.5" SATA hard drive spinning at 5400 RPM with 128MB cache, built for multi-bay NAS enclosures and rated for 180 TB/yr workloads

  • Total capacity4 TB
  • Interface typeSATA
  • Form factor3.5 in (8.89 cm)
  • Rotational speed5,400 RPM
  • Cache memory128 MB

Capacity 4TB

Show 4 more
  • Designed for 24x7 NAS operation with NASware firmware
  • 4 TB capacity for growing data storage needs
  • 180 TB/yr workload rating handles heavy RAID use
  • 128 MB cache boosts read/write responsiveness
  • 5400 RPM SATA interface balances speed and power efficiency

Capacity and workload rating

This Western Digital WD40EFZZ drive provides four terabytes of storage on a 3.5-inch SATA platform spinning at 5400 RPM. It is built for small-to-medium business NAS enclosures that run continuously and is rated for up to 180 terabytes of writes per year.

Bay count and firmware

Before ordering, confirm that your NAS chassis supports no more than eight drive bays, as the firmware is validated for that limit. The drive uses a standard SATA data and power connection and requires a free 3.5-inch bay with adequate airflow.

Thermals and power profile

In normal 24-by-7 operation the drive runs at modest spindle speed, keeping heat output and acoustic levels low for a multi-bay array. The 128-megabyte cache helps smooth bursts without increasing sustained power draw.

How it compares

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

Price $138.99
Pricier than about 57% 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 $34.75 per TB
Cheaper than about 76% of the 2,365 comparable items (median $62.21 per TB).

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Specifications

Product
Brand nameWestern Digital
Model nameWD40EFZZ
Part numberWD40EFZZ
Total capacity4 TB
Performance
Rotational speed5,400 RPM
Storage
Cache memory128 MB
Ports & slots
Interface typeSATA
Size & build
Form factor3.5 in (8.89 cm)
Shipping weight0.64 kg
Package size194 × 127 × 64 mm

Other versions of this model

5 more in the same range

Questions about this item

Does the WD40EFZZ include mounting screws or cables, or must they be purchased separately?

The drive ships in retail or OEM packaging that may vary; mounting screws and SATA data or power cables are not included and must be sourced separately.

Should I choose the 4 TB WD40EFZZ or a larger capacity from the 1-14 TB range for a four-bay NAS?

The 4 TB model fits the 180 TB/yr workload rating and 8-bay limit; select a higher capacity only if your storage growth plan exceeds 4 TB per drive slot.

What does the 5400 RPM rating mean for actual file-transfer speed in a RAID array?

At 5400 RPM with a 128 MB cache the drive sustains sequential throughput suitable for multi-user NAS workloads while keeping power draw and noise low in 24x7 operation.

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