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 every moment with storage that never blinks.

ALL FRAME TECHNOLOGY - Smooth video playback with minimized frame loss for crystal-clear security.
MASSIVE 6 TB STORAGE - Store months of high-def surveillance footage without compromise.
BUILT FOR 24 7 SURVEILLANCE - Engineered to endure constant heat and vibration in demanding NVR environments.
TRUSTED DURABILITY WARRANTY - Backed by Western Digital’s 3-year limited warranty for peace of mind.
SEAMLESS MULTI BAY COMPATIBILITY - Effortlessly scale your system with support for over eight hard drive bays.

The Western Digital Purple 6TB Surveillance Hard Drive is purpose-built for continuous, high-definition video recording. Featuring AllFrame technology to reduce frame loss and support for multi-bay NVR systems, it delivers reliable, scalable storage designed to withstand the heat and vibration of 24/7 surveillance environments. With a 3-year warranty, it’s the trusted choice for professional-grade security setups.

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; 571.53 g
Item model number	WD64PURZ-SPBWUY0
Hard Drive Size	6 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
Country of Origin	China
Item Weight	572 g

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