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 capacity

🔄180 TB/yr workload endurance

❄️5400 RPM cool & quiet spin

Description

💼 Elevate your NAS game with WD Red: storage that works as hard as you do.

TRUSTED NAS BRAND - Western Digital’s WD Red series is the go-to choice for professionals who demand dependable, always-on storage.
MASSIVE 4 TB STORAGE - Store your entire digital life with room to spare—perfect for growing NAS libraries.
HIGH WORKLOAD RATING - Handles up to 180 TB/year workload—built to sustain heavy data transfers without breaking a sweat.
ENGINEERED FOR 24 7 NAS USE - Optimized NASware 3.0 firmware ensures seamless compatibility and rock-solid reliability in multi-bay NAS setups.
WHISPER QUIET COOL OPERATION - 5400 RPM design reduces heat and noise, keeping your home office or small business environment distraction-free.

The WD Red 4TB NAS Internal Hard Drive (WD40EFAX) is purpose-built for small office and home NAS systems with up to 8 bays. Featuring NASware 3.0 firmware, it delivers optimized compatibility, reliability, and quiet 24/7 operation at 5400 RPM. With a robust workload rating of 180 TB/year and a 3-year warranty, this drive balances high capacity and endurance, making it ideal for professionals seeking dependable, always-on network storage.

Specifications

ASIN	B083XVY99B
Best Sellers Rank	46,295 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 150 in Internal Hard Drives
Box Contents	SATA cable, manual
Brand	Western Digital
Brand Name	Western Digital
Cache Memory Installed Size	256
Color	Red
Compatible Devices	Desktop
Connectivity technology	SATA
Customer Package Type	Standard Packaging
Customer Reviews	4.5 out of 5 stars 12,268 Reviews
Data Transfer Rate	180 Megabits Per Second
Digital Storage Capacity	4 TB
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 disk form factor	3.5 Centimetres
Hard disk interface	eSATA
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
Special feature	Portable
Specific Uses For Product	Business, Personal
UPC	718037861036 071803786033
Unit Count	1.0 count

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