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Deal.ai › Western Digital › Internal Hard Drives
Western Digital
Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR

Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR

4.5(45 ratings)

Best price now

$1,070.67at WalmartChecked Nov 9

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Price facts

  • Last seen at $1,070.67 at Walmart on Nov 9.

Our take on the Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR

The WD Red Pro 20TB is a 3.5-inch internal hard drive built for multi-bay NAS systems that run around the clock. It spins at 7200 RPM with a 512MB cache and uses conventional magnetic recording (CMR), which keeps sustained write speeds steady in RAID arrays. WD rates it for high-intensity, multi-user workloads and unlimited NAS bays. It suits small businesses and serious home-lab owners who need dense bulk storage; buyers comparing it with Seagate IronWolf Pro drives weigh its CMR design and five-year warranty against noise and power draw at 7200 RPM.

Best forMulti-bay NAS arrays holding large media or backup setsSmall businesses running 24/7 file sharingHome-lab owners who want CMR drives in RAIDBuyers replacing smaller drives in an existing NAS
Pros
  • 20TB per drive packs a lot of capacity into each bay
  • CMR recording keeps RAID rebuilds and large writes predictable
  • 7200 RPM spindle and 512MB cache give strong sequential throughput
  • Rated for continuous 24/7 operation in multi-user NAS systems
  • Works in RAID-optimized NAS enclosures with unlimited bays
Cons
  • 7200 RPM mechanics run louder and hotter than 5400 RPM NAS drives
  • Needs good airflow and vibration damping in dense arrays
  • Not intended for desktop use or single-drive setups
  • Large rebuild times on multi-terabyte arrays

Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR prices at every store

  • WalmartNew

    In stockSold by Beach Audio IncReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.

    $1,070.67Free shippingChecked Nov 9
    Visit Walmart

What reviewers say

  • 4.5 / 545 ratings

Owners rate it highly, with 4.5 out of 5 from 45 ratings. Buyers mainly praise its capacity, steady RAID performance and reliability in always-on NAS use.

What people mention
  • CapacityPraisedOwners value getting 20TB in a single bay, which cuts the number of drives an array needs.
  • RAID performancePraisedBuyers report steady throughput and predictable behavior in multi-drive arrays.
  • ReliabilityPraisedUsers running drives around the clock describe them as dependable over long periods.
  • NoiseMixedSome owners find the 7200 RPM spindle noticeably louder than slower NAS drives.
  • HeatMixedDense enclosures need airflow; some buyers note the drives run warm under load.

About the Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR

The WD Red Pro is a 20TB 3.5-inch internal SATA hard drive made for NAS (network attached storage) systems. It is engineered for high-intensity workloads in 24x7 multi-user commercial and enterprise NAS environments.

It is built for multi-bay RAID-optimized NAS systems, where businesses store, share and collaborate on large amounts of data. It spins at 7200 RPM, has a 512MB cache and uses CMR recording technology.

Capacity
20 TB
Form factor
3.5-inch internal
Interface
SATA
Speed
7200 RPM
Cache
512 MB
Recording
CMR
Compatibility
RAID-optimized NAS systems with unlimited number of bays
Intended use
24x7 multi-user commercial and enterprise NAS environments

Specifications

hard_drive_capacity
20 TBSource
cache_memory
512 MBSource
compatible_brands
RAID-optimized NAS systems with unlimited # of baysSource
color
MulticolorSource

Questions and answers

Is this drive CMR or SMR?
It is CMR (conventional magnetic recording). That matters in RAID because sustained writes and rebuilds stay predictable.
How does it compare with the non-Pro WD Red?
The Pro line spins at 7200 RPM with a larger cache and is rated for heavier multi-user workloads. Standard WD Red drives are slower and aimed at lighter use.
Will it work in my NAS?
It is a standard 3.5-inch SATA drive and WD rates it for RAID-optimized NAS systems with unlimited bays. Check that your enclosure supports 20TB drives.
Is it good for a desktop PC?
It works, but it is designed for NAS use. A desktop buyer gets less benefit from the RAID tuning and pays for durability they may not need.
What is in the box?
The drive itself. Screws, trays and cables are not included, so you supply mounting hardware for your enclosure.
How loud is it?
At 7200 RPM it is louder than 5400 RPM NAS drives. Expect audible seek noise in a quiet room, especially during rebuilds.
Where is the Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR cheapest?
At Walmart, for $1,070.67, as of our latest check.
What do buyers say about the Western Digital 20TB WD Red Pro NAS SATA HDD, 3.5" Internal Hard Drive HDD, 7200 RPM, 512MB Cache, CMR?
Rated 4.5 out of 5 from 45 ratings.

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