Is this a smr or cmr disk?

This is a SMR Drive. WD##EFRX is CMR (Good for NAS) WD##EFAX is SMR (Bad for NAS)

Why are there two of these on Amazon both exactly the same but different prices? The more expensive one has more reviews.

One is SMR (Shingled Magnetic Recording, the other is not. This SMR version is completely unsuitable for NAS - do not buy it for that purpose. Search online to find the various articles about why SMR technology is entirely improper for NAS, even though Western Digital Red is sold as if it was. WD are being sued in the US to attempt to prevent them doing this - unusually this is not for money but just to block WD so that gives an idea how much of an issue this is. If you have already bought this disk for that purpose, return it and any problems, go down the 'unfit for the purpose for which it was sold/advertised'.

Is this good for nas running cctv?

I use them in my nas although I do not use cctv I cannot see why they would not be ok.

The title of the listing of this product says 4tb but in the spec description it is listed as 3tb. which is it?

Re: Western Digital RED NAS Hard Drives I would be guided by the WD Hard Drive version stated. For Western Digital RED NAS Hard drives it is currently WDxxEFRX, where xx equals the two digit drive size: eg 30 for 3TB, 40 for a 4TB. However, for a 12TB it is normally WD120EFAX. Trust this helps. Regards Ron

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WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX

WD Red 4TB 3.5 Inch NAS Internal Hard Drive - 5400 RPM - WD40EFAX

Product ID: 195809213

Details

Brand
Western
Colour
Red
Compatible devices
Desktop
Connectivity technology
SATA
Digital storage capacity
4 TB
Hard disk description
Mechanical

💾4TB massive storage

⚙️5400 RPM optimized speed

🛡️180TB/year workload durability

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Description

💾 Elevate your NAS game with storage that works as hard as you do!

MASSIVE 4 TB CAPACITY - Store extensive backups, media libraries, and business files without compromise.
HIGH WORKLOAD ENDURANCE - Supports up to 180TB/year workload rate, built to handle heavy data transfer demands reliably.
TRUSTED BRAND ASSURANCE - Western Digital’s Red series is the go-to for professionals seeking dependable, RAID-optimized NAS drives.
ENERGY EFFICIENT 5400 RPM - Lower heat and quieter operation ideal for always-on home or small office NAS environments.
PURPOSE BUILT NAS RELIABILITY - Engineered for 24/7 NAS use with WD NASware firmware ensuring seamless compatibility and data protection.

The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is a purpose-built, 3.5-inch SATA HDD designed specifically for small to medium NAS systems. With a 5400 RPM speed, it balances quiet, cool operation with reliable 24/7 performance. Featuring WD NASware firmware and a robust 180TB/year workload rating, it ensures compatibility and endurance in multi-bay NAS environments. Ideal for professionals and home office users, it offers a trusted, high-capacity storage solution backed by a 3-year limited warranty.

Specifications

ASIN	B083XVY99B
Best Sellers Rank	36,578 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 108 in Internal Hard Drives
Box Contents	SATA cable, manual
Brand Name	Western Digital
Cache Memory Installed Size	256
Color	Red
Compatible Devices	Desktop
Customer Package Type	Standard Packaging
Customer Reviews	4.5 4.5 out of 5 stars (12,276)
Data Transfer Rate	180 Megabits Per Second
Digital Storage Capacity	4 TB
EU Spare Part Availability Duration	3 Years
Enclosure Material	Information Not Available
Form Factor	2.5 in3.5 in
Global Trade Identification Number	00718037861036
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 Centimetres
Hard Disk Interface	eSATA
Hard Disk Rotational Speed	5400 RPM
Hard-Drive Size	4 TB
Hardware Connectivity	SATA 6.0 Gb/s
Hardware Platform	Mac, PC
Installation Type	Internal Hard Drive
Item Dimensions L x W x Thickness	37.4L x 6.7W x 25.8Th centimetres
Item Type Name	HDD
Item Weight	560 Grams
Manufacturer	Western Digital
Manufacturer Part Number	WD40EFAX
Media Speed	22,5 mégaoctets par seconde
Model Name	DISQUE DUR WD RED 4TO 64MO CACHE SATAIII WD40EFAX (NAS STORAGE) 1036
Model Number	WD40EFAX
Network Connectivity Technology	SATA
Number of Items	1
Product Features	Portable
Product Warranty	maker
Read Speed	180 Megabytes Per Second
Specific Uses For Product	Business, Personal
UPC	718037861036 071803786033
Unit Count	1.0 count

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€ 492.89

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Desertcart purchases this item on your behalf and handles shipping, customs, and support to Austria.

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