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.

ASIN	B082LNS4JZ
Are Batteries Included	No
Best Sellers Rank	#12,931 in Computers ( See Top 100 in Computers ) #60 in Internal Hard Drives
Brand	Western Digital
Color	Purple
Customer Reviews	4.5 4.5 out of 5 stars (1,100)
Date First Available	30 October 2019
Form Factor	3.5-inch
Hard Disk Description	Mechanical Hard Disk
Hard Disk Rotational Speed	7200 RPM
Hard Drive Interface	Serial ATA-600
Hard Drive Size	10 TB
Hardware Platform	Mac, PC
Item Weight	716 g
Item model number	WD102PURZ
Manufacturer	Western Digital
Product Dimensions	2.61 x 14.7 x 10.16 cm; 716 g
Series	WD102PURZ

Western Digital WD Purple Surveillance Hard Drive 10TB WD102PURZ

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