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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Western Digital 2TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD23PURZ

Western Digital 2TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD23PURZ

Product ID: 541697425

Details

Brand
WD
Colour
Purple
Compatible devices
Desktop
Connectivity technology
SATA
Digital storage capacity
2000 GB
Hard disk description
Mechanical

⚡SATA 6 Gb/s interface speed

💾2TB storage capacity

🛡️Supports 180 TB/year workload

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Description

💜 Secure your space with speed and stamina!

MASSIVE 2 TB CAPACITY - Store months of high-definition surveillance footage without worrying about running out of space.
BLAZING FAST DATA FLOW - SATA 6 Gb/s interface combined with 64 MB cache delivers smooth, lag-free video recording and playback.
DURABLE EFFICIENT DESIGN - Low 5400 RPM speed balances power efficiency with performance, keeping your system cool and quiet.
SURVEILLANCE GRADE RELIABILITY - Engineered specifically for 24/7 write-intensive surveillance workloads, ensuring your security footage is always safe.
OPTIMIZED FOR MULTI CAMERA SYSTEMS - WD AllFrame technology reduces video frame loss and improves playback, perfect for setups with multiple cameras.

The Western Digital 2TB WD Purple Surveillance Internal Hard Drive is a 3.5-inch SATA 6 Gb/s HDD designed for mainstream surveillance systems. Featuring 64 MB cache and WD AllFrame technology, it supports up to 180 TB/year workload, ensuring reliable, high-quality video capture and playback for multi-camera setups.

Specifications

ASIN	B0C4WX4YPD
Additional Features	Portable
Brand	WD
Built-In Media	Internal Hard Drive
Cache Memory Installed Size	64
Color	Purple
Compatible Devices	Desktop
Connectivity Technology	SATA
Customer Package Type	Standard Packaging
Customer Reviews	4.3 4.3 out of 5 stars (1,003)
Digital Storage Capacity	2000 GB
Enclosure Material	Aluminum
Form Factor	3.5-inch
Global Trade Identification Number	00718037896199
Hard Disk Average Latency	5.55 Milliseconds
Hard Disk Description	Mechanical Hard Disk
Hard Disk Form Factor	3.5 Inches
Hard Disk Interface	Serial ATA-600
Hard Disk Rotational Speed	5400 RPM
Hard-Drive Size	2 TB
Hardware Connectivity	SATA 6.0 Gb/s
Installation Type	Internal Hard Drive
Item Type Name	Internal Hard Drive
Item Weight	0.99 Pounds
Manufacturer	Western Digital Technologies, Inc.
Media Speed	180 MB/s
Mfr Part Number	WD23PURZ-SPC5HY0
Model Name	WD Purple HDD
Model Number	WD23PURZ-SPC5HY0
Number of Items	1
Read Speed	180 Megabytes Per Second
Specific Uses For Product	Business
UPC	718037896199
Unit Count	1.0 Count

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