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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Description

🔒 Secure your world with storage that never sleeps!

GENEROUS 256 MB CACHE - Smooth and efficient data handling for uninterrupted recording.
MASSIVE 4 TB CAPACITY - Store endless hours of surveillance footage without compromise.
BLAZING FAST SATA 6 GB S - Experience rapid data transfer speeds that keep your security system responsive.
TRUSTED WD PURPLE RELIABILITY - Engineered specifically for surveillance, ensuring your footage is always safe.
OPTIMIZED FOR 24 7 SURVEILLANCE - Built to handle continuous, high-write workloads with reliability.

The Western Digital 4TB WD Purple Surveillance Internal Hard Drive is a 3.5-inch SATA HDD designed specifically for continuous 24/7 video surveillance. Featuring a large 4TB capacity, a fast SATA 6Gb/s interface, and a 256MB cache, it ensures smooth, reliable recording and playback of high-definition security footage. Built to withstand the demands of constant operation, this drive is the trusted choice for professional-grade surveillance systems.

Specifications

Brand	ウエスタンデジタル(Western Digital)
Manufacturer	Western Digital Technologies, Inc.
Series	WD Purple HDD
Product Dimensions	14.71 x 10.16 x 2.62 cm; 571.53 g
Batteries	1 AAAA batteries required.
Item model number	WD43PURZ
Is Discontinued By Manufacturer	No
Color	purple
Form Factor	3.5-inch
Item dimensions W x H	14.7 x 10.2 x 2.6 cm
Hard Drive Size	4 TB
Hard Disk Description	Hybrid Drive
Hard Drive Interface	Serial ATA
Hard Disk Rotational Speed	5400 RPM
Are Batteries Included	No
Lithium Battery Energy Content	2.6 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	5 g
Number Of Lithium Ion Cells	4
Item Weight	572 g

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