Hard Drive, 4TB, Designed Specifically for Surveillance Use

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Uncompromising Storage with a Surveillance Hard Drive

These drives are engineered specifically for surveillance to help withstand the elevated heat fluctuations and equipment vibrations within NVR environments. An average desktop drive is built to run for only short intervals, not the harsh 24/7 always-on environment of a high-definition surveillance system. With our hard drives, you get reliable, surveillance-class storage that’s tested for compatibility in a wide range of security systems. Exclusive AllFrame™ technology helps reduce frame loss and improve overall video playback.

Exclusive AllFrame Technology
All drives are equipped with AllFrame technology, which improves ATA streaming to help reduce frame loss and improve overall video playback, within a multitude of security video solutions.

Enhanced Workload Ratings
These drives feature a workload rating of up to 180TB/year2 - up to three times that of desktop drives - to handle the unique demands of mainstream video surveillance DVR and NVR systems. 

Multiple Cameras, Multiple Streams
Modern recorders now support multiple video streams per camera. WD Purple drives support up to 64 single-stream HD cameras (6TB1 and above), and can also support many of the latest cameras that transmit multiple streams to enable basic AI functionality. With so many options, you have the flexibility to upgrade or expand your security applications in the future.

Designed for Today's and Tomorrow's Surveillance Solutions
With an MTBF of up to 1 million hours3, WD Purple drives are engineered for mainstream surveillance DVRs and NVRs that operate 24/7. With tarnish-resistant components3 and support for more than eight bays4, WD Purple drives deliver reliable operation even in harsh environments.


Model NumberADD-4TB
Formatted capacity4TB
Form factor3.5-inch
Advanced formatYes
Recording technologyCMR
RoHS compliantYes
Product Features
Cameras supportedUp to 64
Drive bays supported16
AI streams--
Firmware feature nameAllFrame
Tarnish resistant componentsYes

Interface transfer rate (max)

   Buffer to host

   Host to/from drive (sustained)

6 Gb/s

150 MB/s

Cache (MB)64
Reliability / Data Integrity
Load / unload cycles300,000
Annualized workload rating180TB/yr
Non-recoverable read errors per bits read<1 in 10^14
Limited warranty3 years
Power Management
Read/Write average power requirement5.1W
Idle average power requirement4.5W
Standby & Sleep average power requirement0.4W
Environmental Specifications

Temperature (°C, on the base casting)



0 to 65

-40 to 70

Shock (Gs)

   Operating (2ms. read/write)

   Operating (2ms, read)

   Non-operating (2ms)




Acoustics (dBA)


   Seek (average)



Physical Dimensions
Height (in/mm, max)1.028/26.1
Length (in/mm, max)5.787/147
Width (in/mm, max)4/101.6
Weight (lb/kg, +/-10%)1.50/0.68

Aiming Towards Excellence

Uniview is the pioneer and leader of IP video surveillance. Originally
introduced IP video surveillance system in China but, through consistent innovation,
Uniview now is the fourth largest manufacturer in the world. We continue to
reinvest into our technology, providing our customers with the best possible surveillance

With 16 years of technological exploration, Uniview continues to evolve, expanding
from video surveillance to AIoT. Our video surveillance product lines range includes
IP cameras, NVR, Encoders, Decoders, Storage Expansion, Client Software and Smart
Device Apps.  Our AIoT products range
from digital displays, intelligent access control, smart office, and smart

Uniview provides professional solutions covering all industries, delivered
more than 7000 cases in smart city, transportation, industrial park,
commercial, bank, residential, school, healthcare etc.

Our Vision:

Unlimited New View

Our Mission:

The Uniview team considers themselves to be citizens of the world and endeavors
to build a safer world based on ethics and professionalism, always moving
forward with fortitude to achieve progress and innovation.


To continuously improve through innovation while remaining pragmatic. To be collaborative
with our partners to allow us to grow together.  

Social Responsibility:

Uniview strives to protect the environment through efficient manufacturing
that minimizes waste.  As we continue to
grow, we stay focus on being eco-friendly in both our production facilities and
our business practices. Our manufacturing facilities are certified ISO14000 and

Uniview also shares humanitarian beliefs and feels strongly that we should
give back to society. We have volunteer teams that has held several charitable
activities providing aid to people in need.

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