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 6TB Western DigitalPurple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD64PURZ

Product ID: 540748809

Details

Brand
WD
Colour
Purple
Compatible devices
Desktop
Connectivity technology
SATA
Digital storage capacity
6000 GB
Hard disk description
Mechanical

⚡SATA 6 Gb/s ultra-fast interface

💾6TB massive storage

🛡️AllFrame tech reduces frame loss

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Sold byAmazon VietnamDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛡️ Keep your watchful eye sharp with WD Purple — the ultimate 24/7 surveillance powerhouse!

MASSIVE 6 TB CAPACITY - Store months of high-definition footage with ease—never worry about running out of space.
ALL FRAME 4 K TECHNOLOGY - Minimizes dropped frames and ensures smooth, crystal-clear video playback.
SEAMLESS COMPATIBILITY - Plug-and-play with most NVR/DVR systems for effortless surveillance upgrades.
HIGH WORKLOAD ENDURANCE - Handles up to 180TB/year workload—3x more than typical desktop drives for relentless performance.
SURVEILLANCE GRADE RELIABILITY - Engineered for 24/7 nonstop video recording without overheating or failure.

The Western Digital Purple 6TB HDD is a surveillance-optimized internal hard drive featuring SATA 6 Gb/s connectivity, 256MB cache, and AllFrame 4K technology to reduce video frame loss. Designed for continuous 24/7 operation, it supports heavy workloads up to 180TB/year and is compatible with a wide range of NVR/DVR systems, making it the go-to choice for reliable, high-capacity video storage.

Specifications

ASIN	B0C4WTF5N2
Additional Features	Portable
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	4.2 4.2 out of 5 stars (1,711)
Digital Storage Capacity	6000 GB
Enclosure Material	Aluminum
Form Factor	3.5-inch
Global Trade Identification Number	00718037898339
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	6 TB
Hardware Connectivity	SATA 6.0 Gb/s
Installation Type	Internal Hard Drive
Item Type Name	Internal Hard Drive
Item Weight	1.26 Pounds
Manufacturer	Western Digital (UK) Ltd
Media Speed	180 MB/s
Mfr Part Number	WD64PURZ-SPBWUY0
Model Name	WD Purple HDD
Model Number	WD64PURZ-SPBWUY0
Number of Items	1
Read Speed	180 Megabytes Per Second
Specific Uses For Product	Business
UPC	718037898339

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