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 blinks.

MASSIVE 4 TB CAPACITY - Store months of high-res footage effortlessly with ample space for multi-camera setups.
ROBUST MULTI BAY SUPPORT - Seamlessly integrates with up to 16-bay systems for scalable surveillance expansion.
OPTIMIZED FOR SURVEILLANCE - WD AllFrame tech ensures flawless write-intensive video recording without frame loss.
TARNISH RESISTANT DURABILITY - Engineered with corrosion-resistant components to ensure long-lasting reliability.
EFFICIENT SATA 6 GB S INTERFACE - Experience fast, stable data transfer speeds tailored for continuous video streaming.

The Western Digital 4TB WD Purple HDD is a 3.5-inch mechanical hard drive designed specifically for surveillance systems. Featuring SATA 6 Gb/s interface, 256 MB cache, and WD AllFrame technology, it supports up to 180 TB/year workload and up to 16-bay configurations. Its tarnish-resistant components ensure durability, making it ideal for continuous, write-intensive video recording environments.

Specifications

Brand	Western Digital
Product Dimensions	14.71 x 10.16 x 2.62 cm; 571.53 g
Batteries	1 AAAA batteries required.
Item model number	WD43PURZ
Manufacturer	Western Digital Technologies, Inc.
Series	WD Purple HDD
Color	Purple
Form Factor	3.5-inch
Hard Drive Size	4 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	Serial ATA-600
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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