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 - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ

Product ID: 536360310

Details

Brand
WD
Color
Purple
Compatible Devices
Desktop
Connectivity Technology
SATA
Digital Storage Capacity
4000 GB
Hard Disk Description
Mechanical

⚡SATA 6 Gb/s blazing interface

💾4TB massive storage

🛡️256MB cache for smooth streaming

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$538.06

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Lock in flawless security storage — because your footage deserves the best!

ALL FRAME TECH POWER - Reduces frame loss and ensures flawless HD video playback every time.
HIGH WORKLOAD ENDURANCE - Supports up to 180TB/year workload—built to handle intense data streams.
SCALABLE MULTI BAY SUPPORT - Compatible with up to 16-bay systems for expansive surveillance setups.
TARNISH RESISTANT DURABILITY - Special components protect your drive from corrosion, extending lifespan.
SURVEILLANCE GRADE RELIABILITY - Engineered for 24/7 nonstop video recording with heat & vibration resistance.

The Western Digital 4TB WD Purple HDD is a surveillance-optimized internal hard drive featuring SATA 6 Gb/s connectivity, a 256MB cache, and AllFrame technology to minimize video frame loss. Designed for 24/7 operation, it supports high workload rates up to 180TB/year and multi-bay systems up to 16 drives, making it ideal for professional-grade security systems.

Specifications

ASIN	B0C4X6RDV8
Additional Features	Portable
Best Sellers Rank	#30 in Internal Hard Drives
Brand	WD
Built-In Media	Internal Hard Drive
Cache Memory Installed Size	256
Color	Purple
Compatible Devices	Desktop
Connectivity Technology	SATA
Customer Package Type	Standard Packaging
Customer Reviews	4.3 4.3 out of 5 stars (1,245)
Digital Storage Capacity	4000 GB
Enclosure Material	Aluminum
Form Factor	3.5-inch
Global Trade Identification Number	00718037898308
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 Inches
Hard Disk Interface	Serial ATA-600
Hard Disk Rotational Speed	5400 RPM
Hard-Drive Size	4 TB
Hardware Connectivity	SATA 6.0 Gb/s
Installation Type	Internal Hard Drive
Item Type Name	Internal Hard Drive
Item Weight	1.3 Pounds
Manufacturer	Western Digital Technologies, Inc.
Mfr Part Number	WD43PURZ-SPBWPY0
Model Name	WD Purple HDD
Model Number	WD43PURZ
Number of Items	1
Read Speed	180 Megabytes Per Second
Specific Uses For Product	Business
UPC	718037898308
Unit Count	1.0 Count
Warranty Description	3 Year Limited Warranty

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