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

🎥 Keep every frame flawless with WD Purple — the heartbeat of your surveillance system!

ROBUST 256 MB CACHE - Ensures seamless data transfer under heavy workloads
ALL FRAME TECHNOLOGY - Minimizes frame loss for flawless HD video playback
MASSIVE 4 TB CAPACITY - Store months of high-definition footage effortlessly
SUPPORTS UP TO 16 BAYS - Scales with your multi-camera security setup
SURVEILLANCE GRADE RELIABILITY - Engineered for nonstop 24/7 video recording without fail

The WD Purple 4TB Internal Hard Drive is purpose-built for surveillance systems, featuring AllFrame technology to reduce video frame loss and a 256MB cache to handle intensive write workloads. With a 5400 RPM speed and support for up to 180TB/year workload, it’s optimized for 24/7 operation in multi-bay NVR environments, ensuring reliable, high-capacity storage for professional-grade security setups.

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
Colour	WD 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
Voltage	28 Volts
Are Batteries Included	No
Lithium Battery Energy Content	2.6 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	5 Grams
Number Of Lithium Ion Cells	4
Item Weight	572 g
Guaranteed software updates until	unknown

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