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(Old Model) WD Green 4TB Desktop Hard Drive: 3.5-inch, SATA 6 Gb/s, IntelliPower, 64MB Cache WD40EZRX
Western Digital

WD Green 4TB Desktop Hard Drive: 3.5-inch, SATA 6 Gb/s, IntelliPower, 64MB Cache WD40EZRX

Bottom line: The Western Digital WD Green 4TB Desktop Hard Drive: 3.5-inch ($129.10 on Amazon as of 2026-10-06): 4TB capacity holds about 800,000 photos or 300 hours of HD video; main trade-off: intelliPower variable spin speed, not a 7200 RPM performance drive.

$129.10

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Buy on Amazon — $129.10 Compare to similar drives & media

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ 4TB capacity holds about 800,000 photos or 300 hours of HD video
  • ✓ Draws just 4.5W read/write, 3.3W idle, 0.4W standby and sleep
  • ✓ Quiet 25 dBA idle, 28 dBA seek, per WD acoustics ratings
  • ✓ IntelliSeek tunes seek speed to cut vibration in multi-drive bays

Cons

  • ✗ IntelliPower variable spin speed, not a 7200 RPM performance drive
  • ✗ 150 MB/s sustained transfer is slow next to any SATA SSD
  • ✗ Bare drive only: no screws, cables, or manuals in the box
  • ✗ 2 year limited warranty is short for a 4TB archive drive

Manufacturer description

The WD Green 4TB Desktop Hard Drive (WD40EZRX) is a 3.5-inch SATA 6 Gb/s mechanical drive built by Western Digital for bulk cold storage rather than boot duty. Its IntelliPower design tunes spin speed, transfer rate, and caching algorithms together, which is how Western Digital gets read/write draw down to 4.5 watts and idle to 3.3 watts, and why WD rates the Green line at up to 40 percent lower power consumption. IntelliSeek calculates optimum seek speeds to cut noise and vibration further, landing acoustics at roughly 25 dBA idle and 28 dBA seeking. Sustained host transfer is rated at 150…

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SpecPicks Verdict

SpecPicks scored Western Digital WD Green 4TB Desktop Hard Drive: 3.5-inch using a rating × review-volume × price-fit model applied to published specs and reviews across the drives & media category. Western Digital's drives & media lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for drives & media of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

How fast is the WD40EZRX?

Western Digital rates sustained host transfer at 150 MB/s over a SATA 6 Gb/s interface, with a 64MB cache and a 6 Gb/s buffer-to-host rate. Spin speed is IntelliPower rather than a fixed RPM.

Is this WD Green 4TB drive quiet enough for a desk-side PC?

WD rates it at about 25 dBA idle and 28 dBA in seek mode, and IntelliSeek lowers seek speeds specifically to reduce noise and vibration.

Does it come with mounting screws and a SATA cable?

No. The package includes the hard drive only, with no screws, cables, or manuals. Buy mounting hardware and a SATA data cable separately.

How much power does it use?

It draws 4.5 watts read/write, 3.3 watts idle, and 0.4 watts in both standby and sleep, with a 1.75 A peak on the 12VDC rail. WD rates the Green line at up to 40 percent lower power consumption.

What warranty comes with it?

It carries a 2 year limited warranty from Western Digital. Because this is listed as an older model, check the product listing for current warranty and return terms before buying.

Key Features

  • WD Green hard drives reduce power consumption by up to 40% and offer best-in-class acoustics and operating temperature and 3rd generation SATA interface.
  • IntelliPower - A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings and solid performance.
  • IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration.
  • 4 TB capacity holds up to 800,000 digital photos, 1,000,000 MP3 files, and 300 hours of HD video.
  • 2 year limited warranty.
  • Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary.

Full Specifications

BrandWestern Digital
ColorGreen
Model NameGreen
Read Speed150 Megabytes Per Second
Unit Count1.0 Count
Form Factor3.5-inch
Media Speed100 MB/s
Model NumberWD40EZRX
Built-In MediaHard Drive
Hard-Drive Size4 TB
Mfr Part NumberWD40EZRX
Number of Items1
Special FeaturePortable
Item Part NumberWD40EZRX
Vibration/RumbleYes
Hardware PlatformPC
Installation TypeInternal Hard Drive
Compatible DevicesDesktop
Data Transfer Rate6 Gigabits Per Second
Enclosure MaterialAluminum/Glass

Ready to buy?

(Old Model) WD Green 4TB Desktop Hard Drive: 3.5-inch, SATA 6 Gb/s, IntelliPower, 64MB Cache WD40EZRX is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $129.10

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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(Old Model) WD Green 4TB Desktop Hard Drive: 3.5-inch, SATA 6 Gb/s, IntelliPower, 64MB Cache WD40EZRX
$129.10
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