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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🎥 Keep your security sharp with storage that never blinks.

ROBUST BUILD - Durable 3.5-inch mechanical drive designed to withstand heat fluctuations and vibrations.
POWER SMART DESIGN - Consumes just 3.8 watts, reducing energy costs without sacrificing performance.
WIDE COMPATIBILITY - Tested across numerous security systems for seamless integration.
ALL FRAME TECHNOLOGY - Minimizes frame loss to ensure smooth, uninterrupted HD video playback.
SURVEILLANCE GRADE RELIABILITY - Engineered for 24/7 always-on performance in demanding NVR environments.

The Western Digital WD22PURZ 2TB Purple HDD is a surveillance-optimized mechanical hard drive designed for continuous 24/7 operation. Featuring AllFrame technology to reduce video frame loss, it delivers reliable, power-efficient storage tailored for high-definition security camera systems, with proven compatibility and durability against heat and vibration.

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Brand	Western Digital
Product Dimensions	14.7 x 10.16 x 2.61 cm; 449.06 g
Item model number	WD22PURZ
Manufacturer	XILENCE
Series	Purple HDD
Color	Purple
Form Factor	3.5-inch
Hard Drive Size	2 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	Serial ATA
Wattage	3.8 watts
Hardware Platform	PC
Are Batteries Included	No
Lithium Battery Weight	1 Kilograms
Item Weight	449 g

Western Digital WD22PURZ 2 TB

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