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, never miss a frame.

MASSIVE STORAGE POWER - 2TB capacity supports extensive footage storage for peace of mind.
SEAMLESS VIDEO PLAYBACK - AllFrame technology ensures smooth, frame-loss-free HD video streaming.
HEAVY DUTY WORKLOAD READY - Handles up to 180TB/year—3x desktop drives—for nonstop recording demands.
PLUG PLAY COMPATIBILITY - Effortlessly expands your NVR system with broad device support.
UNMATCHED 24 7 RELIABILITY - Built to endure constant surveillance heat and vibrations without fail.

The WD Purple™ 2TB Surveillance Hard Drive is engineered specifically for 24/7 high-definition video surveillance. Featuring AllFrame technology to reduce frame loss and improve playback, it supports heavy workloads up to 180TB/year, making it ideal for modern NVR and DVR systems. With robust heat and vibration resistance and broad compatibility, it ensures reliable, seamless storage backed by a 3-year warranty.

Specifications

Brand	Western Digital
Manufacturer	Western Digital (UK) Ltd, 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; 449.06 g
Item model number	WD23PURZ-SPC5HY0
Hard Drive Size	2 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	Serial ATA-600
Hard Disk Rotational Speed	5400 RPM
Are Batteries Included	No
Included Components	Internal Hard drive
Manufacturer	Western Digital (UK) Ltd
Item Weight	449 g

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