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Western Digital 2TB WD NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD20EFAX, Red
Western Digital

Western Digital 2TB WD NAS Internal Hard Drive HDD

Bottom line: The Western Digital 2TB WD NAS Internal Hard Drive HDD ($219.90 on Amazon as of 2026-10-07): NASware firmware prevents RAID dropouts from normal error-recovery timeouts; main trade-off: SMR recording slows sustained writes and lengthens RAID rebuilds.

$219.90

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Buy on Amazon — $219.90 Compare to similar external storage

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

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ NASware firmware prevents RAID dropouts from normal error-recovery timeouts
  • ✓ Rated for 180TB/yr workload, far above desktop-drive duty cycles
  • ✓ 5400RPM class runs cooler and quieter in sealed multi-bay enclosures
  • ✓ Validated by Western Digital for NAS chassis with up to 8 bays

Cons

  • ✗ SMR recording slows sustained writes and lengthens RAID rebuilds
  • ✗ 5400RPM class trails 7200RPM drives on single-stream throughput
  • ✗ 3-year warranty is shorter than the 5-year Pro-tier NAS drives
  • ✗ 2TB is tight if you plan to fill an 8-bay chassis long term

Manufacturer description

The WD Red WD20EFAX puts 2TB of NAS-tuned storage into a standard 3.5-inch bay, and it's built for the always-on duty cycle that a desktop drive isn't. Western Digital rates it for workloads up to 180TB per year, which covers the read-heavy media serving, Time Machine targets, and nightly backup jobs that a home or home-office NAS actually throws at it. The 5400RPM performance class keeps heat and acoustics down in a sealed multi-bay enclosure, and 256MB of cache absorbs bursty writes over the SATA 6Gb/s interface. What separates this from a bare SATA drive is NASware firmware. It handles…

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SpecPicks Verdict

SpecPicks scored Western Digital 2TB WD NAS Internal Hard Drive HDD using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Western Digital's external storage 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 external storage 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

Is the WD20EFAX an SMR drive, and does that matter?

Yes, this drive uses SMR (shingled magnetic recording). SMR is fine for read-heavy archival and media storage, but sustained random writes and RAID rebuilds run slower than on a CMR drive. If your array sees heavy write traffic or frequent resilvering, look at a CMR-based model instead.

How many drive bays does this support?

Western Digital builds and tests WD Red for NAS systems with up to 8 bays. Beyond that count, the vibration profile exceeds what this tier is validated for.

What warranty comes with this drive?

It carries a 3-year limited warranty from Western Digital. Check the product listing for current terms and regional coverage before purchasing.

Will 5400RPM be fast enough for streaming media from my NAS?

For streaming, yes. The 5400RPM performance class paired with 256MB of cache and a SATA 6Gb/s interface saturates a gigabit network for typical media playback, and the lower spindle speed keeps heat and noise down in a closed enclosure.

Can I mix this with larger WD Red drives in the same array?

The WD Red line runs from 2TB to 6TB in this family, so you can add larger members later. Most NAS arrays size every member to the smallest drive, so a 2TB unit will cap the usable capacity of drives that outsize it.

Key Features

  • Available in capacities ranging from 2-6TB with support for up to 8 bays
  • 5400RPM performance class
  • NASware firmware for compatibility
  • NAS systems with daily workloads associated with personal and home office environments and idle time available to perform necessary background operations
  • Supports up to 180 TB/yr Workload Rate* | * Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours))
  • 3-year limited warranty

Full Specifications

BrandWestern Digital
ColorRed
Model NameWD Red NAS Internal Hard Drive
Read Speed180 megabytes_per_second
Unit Count1 Count
Form Factor3.5-inch
Media Speed150-180 MB/s
Model NumberWD20EFAX
Built-In MediaSSD
Item Type NameInternal Hard Drive
Hard-Drive Size2 TB
Mfr Part NumberWD20EFAX
Number of Items1
Special FeaturePortable
Hardware PlatformMac, PC
Installation TypeInternal Hard Drive
Compatible DevicesDesktop
Data Transfer Rate180 megabits_per_second
Enclosure MaterialAluminum or Glass
Additional FeaturesPortable
Full listing titleWestern Digital 2TB WD NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD20EFAX, Red

Ready to buy?

Western Digital 2TB WD NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD20EFAX, Red 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 — $219.90

*Price sourced from Amazon.com. Last updated 2026-10-07. Price and availability subject to change.

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Western Digital 2TB WD NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, SMR, 256MB Cache, 3.5" - WD20EFAX, Red
$219.90
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