Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.
TermsPrivacy
Deal.ai › Western Digital › Hard Drives & Storage
Western Digital
Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ

Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ

4.8(12 ratings)

Best price now

$194.99at Best BuyChecked 23 h ago

Compared across 6 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.

Visit Best Buy
Western Digital discount code →

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Last seen at $194.99 at Best Buy on Nov 9.
  • Checked at 6 stores.

Our take on the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ

The WD Red Plus 4TB (WD40EFZZ) is a 3.5-inch internal hard drive built for NAS boxes and RAID arrays. It spins at 5400 rpm with a 128MB cache on a SATA 6Gb/s interface, and WD rates it for continuous 24/7 operation in multi-bay enclosures. It uses conventional magnetic recording rather than shingled recording, so it rebuilds RAID arrays at normal speed. Against Seagate IronWolf and Toshiba N300 drives of the same size, it is the quiet, low-power pick rather than the fastest. It suits home and small-office NAS owners who want dependable bulk storage more than peak throughput.

Best forHome and small-office NAS ownersRAID arrays in 2 to 8 bay enclosuresAlways-on backup and media storageBuyers who want a quiet, low-power drive
Pros
  • Rated for 24/7 continuous NAS use
  • CMR recording, so RAID rebuilds stay predictable
  • 128MB cache and 5400 rpm keep it quiet and cool
  • Vibration control for multi-bay enclosures
  • Three-year limited warranty
Cons
  • 5400 rpm is slower than 7200 rpm desktop drives
  • Not intended as a boot or desktop system drive
  • 4TB fills quickly in media-heavy arrays
  • No helium fill or higher workload rating like WD Red Pro

Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ prices at every store

  • Best BuyNew

    In stock

    $194.99Free shippingChecked 23 h ago
    Visit Best Buy
  • NeweggNew

    In stock

    $194.99Free shippingChecked 23 h ago
    Visit Newegg
  • WalmartNew

    In stockSold by Newegg Inc.Returns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $199.98+ $10.81 shippingChecked 23 h ago
    Visit Walmart
  • AntonlineNew

    In stock

    $222.23Free shippingChecked 23 h ago
    Visit Antonline
  • StaplesNew

    In stock

    $283.19Free shippingChecked 23 h ago
    Visit Staples
  • QuillNew

    Out of stock

    $216.99Free shippingChecked 23 h ago
    Visit Quill

Store links may earn us a commission. Some prices via Klarna.

Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ price history

Lowest price we've seen: $194.99 on Nov 10 at Best Buy. Tracked across 5 stores since Nov 10.

What reviewers say

  • 4.8 / 512 ratings

Owners rate it highly, with 4.8 out of 5 from 12 ratings. Feedback centers on quiet running and steady behavior in NAS enclosures.

What people mention
  • NoisePraisedOwners say the 5400 rpm spin and seek noise stay low inside a NAS enclosure.
  • ReliabilityPraisedBuyers report steady operation in always-on arrays with no early failures.
  • SpeedMixedReviewers find throughput adequate for backups but slow for large file transfers.
  • HeatPraisedThe drive runs cool, which owners like in cramped multi-bay cases.
  • CapacityMixedSome owners say 4TB fills fast once photos and video are added.

About the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ

WD Red Plus internal HDDs are designed to handle workloads for power users and small to medium business NAS environments. WD Red Plus drives deliver the speed and capacity required to store, protect and share growing amounts of data in mid-sized RAID-optimized NAS systems with increased power efficiency.

Specifications

color
RedSource
Form Factor
3.5"Source
Type
HDDSource
Placement
InternalSource

Questions and answers

Is this drive CMR or SMR?
It is CMR. WD lists the WD40EFZZ as conventional magnetic recording, so RAID rebuilds and large writes behave predictably.
Can I use it in a desktop PC?
Yes, it works as a SATA drive in a desktop, but its 5400 rpm speed suits storage and backup more than a system drive.
How many drives can I put in one NAS?
WD rates Red Plus for multi-bay NAS systems, typically up to 8 bays. Larger arrays call for Red Pro.
Does it come with cables or a mounting bracket?
No. It ships as a bare internal drive, so you supply the SATA cable and any tray your enclosure needs.
Is it worth it over a plain desktop drive?
For an always-on NAS, yes. The 24/7 rating and vibration control matter more than the lower spin speed costs you.
Does it work with Synology and QNAP NAS?
Yes. It is a standard 3.5-inch SATA drive and appears on the compatibility lists of both vendors.
Where is the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ cheapest?
At Best Buy, for $194.99, as of our latest check.
What do buyers say about the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ?
Rated 4.8 out of 5 from 12 ratings.
Where can I buy the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ?
6 stores we checked sell it, including Walmart, Best Buy, Newegg, Quill, Antonline.

Stores we've priced the Western Digital Red Plus 4TB 3.5" 5400rpm SATA Internal Hard Disk Drive WD40EFZZ at

  • Best Buy deals and prices
  • Newegg deals and prices
  • staples.com deals and prices

More from Western Digital

  • W
    Western Digital WD Black SN770 NVMe SSD 1TB
    Western Digital WD Black SN770 NVMe SSD 1TB
  • W
    Western Digital WD Blue SA510 SATA 2.5" SSD 250GB
    Western Digital WD Blue SA510 SATA 2.5" SSD 250GB
  • W
    Western Digital PC SN520 M.2 2242 256GB PCIe Gen3 x2 NVMe 1.3 64-layer 3D NAND Internal Solid State Drive (SSD) SDAPMUW-256G
    Western Digital PC SN520 M.2 2242 256GB PCIe Gen3 x2 NVMe 1.3 64-layer 3D NAND Internal Solid State Drive (SSD) SDAPMUW-256G
  • W
    Western Digital PC SN530 SDBPNPZ M.2 2280 NVMe Solid State Drive 256 GB
    Western Digital PC SN530 SDBPNPZ M.2 2280 NVMe Solid State Drive 256 GB
  • W
    Western Digital WD Black SN850X 4TB NVMe M.2 SSD
    Western Digital WD Black SN850X 4TB NVMe M.2 SSD
  • W
    WD Blue SA510 Solid State Drive
    WD Blue SA510 Solid State Drive
  • W
    Western Digital WD Black SN850X 1TB NVMe M.2 Internal SSD
    Western Digital WD Black SN850X 1TB NVMe M.2 Internal SSD
  • W
    Western Digital WD Green SN350 Solid State Drive
    Western Digital WD Green SN350 Solid State Drive
All Western Digital deals and products →

More internal hard drives

  • S
    Seagate Hard Drive
    Seagate Hard Drive
  • S
    Seagate SkyHawk ST4000VX016 Hard Drive
    Seagate SkyHawk ST4000VX016 Hard Drive
  • W
    Western Digital WD Red Plus 8TB NAS Internal Hard Drive (WD80EFZZ)
    Western Digital WD Red Plus 8TB NAS Internal Hard Drive (WD80EFZZ)
  • W
    Western Digital WD 3.5" Red Plus 8TB SATA III 6Gbps HDD WD80EFPX-WMC4ZN0
    Western Digital WD 3.5" Red Plus 8TB SATA III 6Gbps HDD WD80EFPX-WMC4ZN0
  • W
    WD Red Plus 8TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 256MB Cache, 3.5 Inch - WD80EFAX
    WD Red Plus 8TB NAS Hard Disk Drive - 5400 RPM Class SATA 6Gb/s, CMR, 256MB Cache, 3.5 Inch - WD80EFAX
  • W
    Western Digital WD Red Plus 8TB 5640RPM SATA 6Gb/s 256MB Cache 3.5" NAS Hard Drive (WD80EFPX)
    Western Digital WD Red Plus 8TB 5640RPM SATA 6Gb/s 256MB Cache 3.5" NAS Hard Drive (WD80EFPX)
  • W
    Western Digital WD 3.5" Red Plus 8TB SATA III 6Gbps HDD WD80EFPX-SPC4ZN0
    Western Digital WD 3.5" Red Plus 8TB SATA III 6Gbps HDD WD80EFPX-SPC4ZN0
  • W
    WD80EFZZ Western Digital Red Plus 8TB 5400RPM SATA 6Gb/s 256MB Cache 3.5-Inch NAS Hard drive
    WD80EFZZ Western Digital Red Plus 8TB 5400RPM SATA 6Gb/s 256MB Cache 3.5-Inch NAS Hard drive
Size (GB)
4000Source
Cache Memory (MB)
128Source
RPM
5400 rpmSource
Interface
S-ATA 6Gb/sSource