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.

Hard Drive	4 TB Mechanical Hard Disk
Brand	Western Digital
Series	WD Purple HDD
Item model number	WD43PURZ
Item Weight	1.26 pounds
Product Dimensions	5.79 x 4 x 1.03 inches
Item Dimensions LxWxH	5.79 x 4 x 1.03 inches
Color	Purple
Flash Memory Size	4 TB
Hard Drive Interface	Serial ATA-600
Hard Drive Rotational Speed	5400 RPM
Batteries	1 AAAA batteries required.
Manufacturer	Western Digital Technologies, Inc.
ASIN	B0C4X6RDV8
Is Discontinued By Manufacturer	No
Date First Available	May 10, 2023

Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ

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