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 frame, every second — the ultimate 4TB surveillance powerhouse!

ALL FRAME 4 K TECHNOLOGY - Reduces video errors and interruptions, ensuring crystal-clear, uninterrupted footage.
PRIORITIZED WRITE OPERATIONS - Maximizes performance for write-intensive surveillance applications, minimizing data loss.
SEAMLESS MULTI CAMERA SUPPORT - Optimized to support up to 64 HD cameras simultaneously for comprehensive coverage.
MASSIVE 180 TB ANNUAL WORKLOAD CAPACITY - Handles heavy data streams effortlessly, perfect for high-demand environments.
UNMATCHED 24 7 SURVEILLANCE RELIABILITY - Engineered for continuous, always-on security systems without compromise.

The Western Digital Purple 4TB Surveillance Hard Disk Drive is purpose-built for high-definition, always-on security systems. Supporting up to 180TB of data transfer annually and optimized for up to 64 cameras, it features All Frame 4K technology to reduce video errors and prioritize write operations for flawless surveillance performance.

Specifications

Brand	Western Digital
Manufacturer	EOL, WD
Series	Western Digital Purple
Colour	Purple
Form Factor	3.5-inch
Item Height	1.03 Inches
Item Width	4 Inches
Standing screen display size	10.5 Inches
Product Dimensions	14.7 x 10.16 x 2.61 cm; 680.39 g
Item model number	WD40PURZ
RAM Size	4000 GB
Hard Drive Size	4 TB
Hard Disk Description	Mechanical Hard Disk
Hard Drive Interface	Serial ATA
Hard Disk Rotational Speed	5400 RPM
Wireless Type	802.11a/b/g/n
Number of USB 2.0 Ports	1
Voltage	120 Volts
Wattage	1
Hardware Platform	PC
Are Batteries Included	No
Number of Lithium Ion Cells	5
Number of Lithium Metal Cells	5
Included Components	Hard Drive
Manufacturer	WD
Imported By	RASHI PERIPHERALS PVT LTD.,RASHI COMPLEX A BLDG, SURVEY 186, DONGARIPADA, POMAN, VASAI-E,THANE, MAHARASHTRA-401208
Item Weight	680 g

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