can it replace older hhd in nightowl dvr

Yes. This hard drive is compatible with all recording units.

What is the difference between 3tb purple wd30purz and wd30purz, very confusing?

Absolutely nothing. They are the same.

Is this compatible with annke surveillance camera system 8ch 1080p lite h.264+ dvr with (8) hd 1080p outdoor weatherproof cameras cctv security camera

As the owner of South Jersey Surveillance Systems, I can assure you that any WD purple or Seagate Skyhawk hard drive is the appropriate type of storage drive for any and all DVRs and NVRs.

Whats the difference between this and the red plus?

WD Blue HDDs are mainly used for general purpose storage, they are great all-rounders, and an average user can’t go wrong with Blue. WD Green is basically same as Blue, but it lacks a bit of performance. However, it is the most eco-friendly HDD, and it’s quite cheap. WD Blacks are for pure performance including gaming, media, and content creation. Also one of the most expensive HDDs. WD Red is a NAS drive. It’s optimized for NAS systems. WD Purple is for surveillance. Advised for 24/7 operation. WD Gold, probably the most premium of all. Made for a multitude of Datacenter-specific applications.

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Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ

Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ

Product ID: 43980112

Details

Brand
Western
Color
Purple
Compatible Devices
Desktop
Connectivity Technology
SATA
Digital Storage Capacity
4 TB
Hard Disk Description
Mechanical

💾64 MB cache for smooth video streaming

📹Supports up to 64 HD cameras

⚙️5400 RPM optimized for 24/7 operation

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Description

🔒 Secure every frame, every second — because your peace of mind can’t wait.

SATA 6 GB S SPEED - Fast, reliable data transfer ensures no missed moments in your surveillance.
PEACE OF MIND WARRANTY - Backed by a 3-year limited warranty and data recovery service for ultimate reliability.
ALL FRAME TECHNOLOGY POWER - Reduces video errors and pixelation for crystal-clear footage every time.
MASSIVE MULTI CAMERA SUPPORT - Handles up to 64 HD cameras seamlessly—perfect for scaling your security.
UNSTOPPABLE 24 7 SURVEILLANCE - Engineered for continuous, always-on security systems without compromise.

The Western Digital 4TB WD Purple Surveillance HDD is a 3.5-inch internal hard drive designed specifically for 24/7 high-definition video surveillance. Featuring 5400 RPM speed, SATA 6 Gb/s interface, and 64 MB cache, it supports up to 64 HD cameras with AllFrame technology to minimize video errors and interruptions. Ideal for professional security setups, it comes with a 3-year limited warranty and data recovery service, ensuring reliable, scalable storage for your surveillance needs.

Specifications

ASIN	B071KVB4F8
Additional Features	Data Recovery Service
Best Sellers Rank	#44 in Internal Hard Drives
Brand	Western Digital
Built-In Media	Hard Drive
Cache Memory Installed Size	64
Color	Purple
Compatible Devices	Desktop
Connectivity Technology	SATA
Customer Reviews	4.6 out of 5 stars 4,413 Reviews
Data Transfer Rate	5000 megabits_per_second
Digital Storage Capacity	4 TB
EU Spare Part Availability Duration	3 years
Enclosure Material	Metal
Form Factor	3.5-inch
Global Trade Identification Number	00718037856773
Hard Disk Average Latency	5.56 milliseconds
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 inches
Hard Disk Interface	Serial ATA
Hard Disk Rotational Speed	5400 rpm
Hard-Drive Size	4 TB
Hardware Connectivity	SATA 6.0 Gb/s
Installation Type	Internal Hard Drive
Item Dimensions L x W x Thickness	5.79"L x 4"W x 1.03"Th
Item Type Name	WD Purple 4TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6 Gb/s 64MB Cache 3.5 Inch - WD40PURZ
Item Weight	1.5 pounds
Manufacturer	Western Digital Bare Drives
Mfr Part Number	WD40PURZ
Model Name	Purple
Model Number	WD40PURZ
Number of Items	1
Special Feature	Data Recovery Service
Specific Uses For Product	business, personal
UPC	718037856773
Unit Count	17.6 Ounce
Warranty Description	Western Digital ("WD") values your business and always attempts to provide you the very best of service. No limited warranty is provided by WD unless your WD Product ("Product") was purchased from an authorized distributor or authorized reseller. Distributors may sell Products to resellers who then sell Products to end users. Please see below for warranty information or obtaining service. No warra…

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1647.12 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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