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

🎥 Capture Every Moment, No Compromises.

UNMATCHED ENDURANCE - Handles up to 180TB/year workload—3x more than standard drives, built for nonstop recording.
SCALABLE STORAGE POWER - Supports over 8 bays, perfect for expanding your NVR or DVR system effortlessly.
SEAMLESS 4 K VIDEO PLAYBACK - AllFrame technology minimizes frame loss for crystal-clear surveillance footage.
OPTIMIZED SATA 600 INTERFACE - Fast and reliable data transfer ensures your surveillance system never misses a beat.
TRUSTED DURABILITY WARRANTY - Backed by Western Digital’s 3-year limited warranty for peace of mind.

The Western Digital Purple 4TB Surveillance Hard Drive is engineered specifically for modern video surveillance systems. Featuring AllFrame technology to reduce frame loss and improve playback, it supports heavy workloads up to 180TB per year—triple that of typical desktop drives. Designed for compatibility with multi-bay NVR/DVR setups, it ensures scalable, reliable storage backed by a 3-year limited warranty.

Specifications

Brand	Western Digital
Manufacturer	Western Digital Technologies, Inc, Western Digital UK Ltd, 60 Moo 8, Sethakij Rd., Klong Madeua Kratoom Bean, Samut Sakhon 74110, Thailand.
Series	WD Purple HDD
Colour	Purple
Form Factor	3.5-inch
Item Height	1.03 Inches
Item Width	4 Inches
Product Dimensions	14.71 x 10.16 x 2.62 cm; 571.53 g
Batteries	1 AAAA batteries required.
Item model number	WD43PURZ
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 Weight	5 g
Number of Lithium Ion Cells	4
Included Components	Internal Hard drive
Manufacturer	Western Digital Technologies, Inc
Item Weight	572 g

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