---
product_id: 420527069
title: "4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5\" - WD42PURZ"
brand: "western digital"
price: "$256.06"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/420527069-4tb-wd-purple-surveillance-internal-hard-drive-hdd-sata-6
store_origin: US
region: United States of America
---

# SATA 6 Gb/s interface speed 4TB storage capacity 256MB cache for smooth video 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ

**Brand:** western digital
**Price:** $256.06
**Availability:** ✅ In Stock

## Summary

> 🔒 Lock in your security with storage that never sleeps!

## Quick Answers

- **What is this?** 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ by western digital
- **How much does it cost?** $256.06 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/420527069-4tb-wd-purple-surveillance-internal-hard-drive-hdd-sata-6)

## Best For

- western digital enthusiasts

## Why This Product

- Trusted western digital brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **AllFrame Technology:** Minimizes frame loss for crystal-clear video, so your security footage is always flawless.
- • **Massive 4TB Capacity:** Store months of high-res footage with room to spare—never miss a moment.
- • **Blazing SATA 6 Gb/s Speed:** Fast data transfer ensures seamless recording and playback with zero lag.
- • **Easy Plug & Play Installation:** Swap drives effortlessly and save big—no tech degree required.
- • **Surveillance-Grade Reliability:** Built to endure 24/7 high-def security workloads without breaking a sweat.

## Overview

The Western Digital 4TB WD Purple HDD is a surveillance-optimized internal hard drive featuring SATA 6 Gb/s connectivity and a 256MB cache. Engineered for 24/7 operation in demanding environments, it supports up to 180TB/year workload and uses AllFrame technology to reduce video frame loss. Designed for up to 16-bay systems, it offers reliable, high-capacity storage tailored for business and personal security applications.

## Description

The Right Drive for the Right Job. WD Purple 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 WD Purple, you get reliable, surveillance-class storage that’s tested for compatibility in a wide range of security systems, and some of our latest models (WD22PURZ, WD42PURZ, and WD63PURZ) have improved power efficiency. Exclusive AllFrame technology helps reduce frame loss and improve overall video playback.

Review: Super Easy to Install & Works Like A Charm! - I needed to replace the 2 TB hard drive in my NightOwl 3 MP Surveillance Camera system, because the original hard drive quit recording after three years of service. I was on the fence about whether to invest my money into replacing the failed hard drive with this new Western Digital 4TB Purple hard drive, or spend a little bit more money, and replace the entire system. Since I’m not a Computer Tech by any means, the thought of ignoring the manufacturer’s warning labels against opening up the DVR case, and then then having to poke around with a screw driver, to uninstall the old, to replace with it with this new one made me nervous. I understand hard drives to be fragile, and the thought of handling these hard drives during the swap, was scary to me. I couldn’t afford to mess it up. Much to my surprise, it was an extremely simple task. I did watch a utube video on it beforehand, which did help me. It took more time to unscrew the DVR case, than than it did to swap out the parts. It’s just a matter of unplugging the old one, and plugging in this new one. Close the case back up, power on, and follow the on prompts in the screen. This 4Tb Western Digital Purple hard drive made especially for surveillance applications, installs itself from there. It was quick. It was easy, and it has performed. The best part is that it saved me money from having to purchase a whole new system. I’m very happy with my purchase. I believe it was money “well spent”, and I can highly recommend this Purple hard drive, with confidence. Thank you, Western Digital, for producing a quality product
Review: Does what it’s supposed to. Still doing it. - This bad boy is still trucking along in our security system since purchase. Does what it’s supposed to. Fairly quick remote viewing response, fairly low noise, zero downtime. Work horse.

## Features

- Engineered specifically for mainstream surveillance systems.Specific uses: Business, personal
- AllFrame technology delivers optimizations for write-intensive, low bit-rate, high stream-count workloads typical to mainstream surveillance applications.
- Supports up to 180 TB/yr workload rate². | ²Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ✕ (8760 / recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations.
- 1TB¹ through 3TB support up to eight bays; 4TB and above support up to 16 bays and employ tarnish-resistant components for harsher environments.
- ¹As used for storage capacity, 1TB = one trillion bytes. Actual user capacity may be less, depending on operating environment.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09MSDP2DT |
| Additional Features | Data Recovery Service |
| Best Sellers Rank | #15 in Internal Hard Drives |
| Brand | Western Digital |
| Built-In Media | Internal Hard Drive |
| Cache Memory Installed Size | 4 |
| Color | Purple |
| Compatible Devices | Desktop |
| Connectivity Technology | SATA |
| Customer Reviews | 4.6 out of 5 stars 1,245 Reviews |
| Digital Storage Capacity | 4 TB |
| Enclosure Material | Aluminum |
| Form Factor | 3.5-inch |
| Global Trade Identification Number | 00718037887944 |
| Hard Disk Description | Mechanical Hard Disk |
| Hard Disk Form Factor | 3.5 Inches |
| Hard Disk Interface | Serial ATA |
| Hard-Drive Size | 4 TB |
| Hardware Connectivity | SATA 6.0 Gb/s |
| Installation Type | Internal Hard Drive |
| Item Dimensions L x W x Thickness | 5.79"L x 4"W x 1.03"Th |
| Item Height | 1.03 inches |
| Item Weight | 1.26 Pounds |
| Manufacturer | Western Digital Technologies, Inc. |
| Media Speed | 175 |
| Model Name | Purple HDD |
| Model Number | WD42PURZ |
| Number of Items | 1 |
| Read Speed | 175 Megabytes Per Second |
| Special Feature | Data Recovery Service |
| Specific Uses For Product | business, personal |
| UPC | 718037887944 |
| Unit Count | 1.0 Count |
| Warranty Description | 3 year Limited Warranty |

## Product Details

- **Digital Storage Capacity:** 4 TB
- **Hard Disk Interface:** Serial ATA
- **Connectivity Technology:** SATA
- **Brand:** Western Digital
- **Special Feature:** Data Recovery Service
- **Hard Disk Form Factor:** 3.5 Inches
- **Hard Disk Description:** Mechanical Hard Disk
- **Compatible Devices:** Desktop
- **Installation Type:** Internal Hard Drive
- **Color:** Purple

## Images

![4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ - Image 1](https://m.media-amazon.com/images/I/61phbPE+xLL.jpg)
![4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ - Image 2](https://m.media-amazon.com/images/I/81RLMRzl6ML.jpg)
![4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ - Image 3](https://m.media-amazon.com/images/I/81oySjLJmKL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: capacidad 1tb y estilo 4 tb, es un error?**
A: Como sabras,el HDD que compré,fue para ser instalado en un sistema de camaras o sea en un NVR para correr con 14 camaras IP,y se suponia que se pudiera hacer un FORMAT para ponerlo a trabajar,pero al ejecutar la operacion nunca la realizó. De modo que de ninguna manera se pudo hacer la operacion y hubo de abortarse su uso. Esta es la informacion del disco: Western Digital Disco duro interno de vigilancia púrpura de 4 TB - SATA 6 Gb/s .
La pregunta technica que me haces,creo que no viene al caso,pues el frabricante del disco dice en sus recomendaciones,que puede trabajar hasta con 64 camaras y yo solo uso 14 en el sistema que poseo.

**Q: What is the warranty for this had? I don't see it listed anywhere.**
A: Three-Year Limited Warranty
As an industry-leading hard drive manufacturer, Western Digital stands behind their surveillance storage solutions with a 3-year limited warranty6 included with every WD Purple drive.

**Q: Would this hard drive work with the night owl btd2 system?**
A: If its SATA format

**Q: Is this 4K?**
A: I believe it is.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Super Easy to Install & Works Like A Charm!
*by D***D on July 22, 2022*

I needed to replace the 2 TB hard drive in my NightOwl 3 MP Surveillance Camera system, because the original hard drive quit recording after three years of service. I was on the fence about whether to invest my money into replacing the failed hard drive with this new Western Digital 4TB Purple hard drive, or spend a little bit more money, and replace the entire system. Since I’m not a Computer Tech by any means, the thought of ignoring the manufacturer’s warning labels against opening up the DVR case, and then then having to poke around with a screw driver, to uninstall the old, to replace with it with this new one made me nervous. I understand hard drives to be fragile, and the thought of handling these hard drives during the swap, was scary to me. I couldn’t afford to mess it up. Much to my surprise, it was an extremely simple task. I did watch a utube video on it beforehand, which did help me. It took more time to unscrew the DVR case, than than it did to swap out the parts. It’s just a matter of unplugging the old one, and plugging in this new one. Close the case back up, power on, and follow the on prompts in the screen. This 4Tb Western Digital Purple hard drive made especially for surveillance applications, installs itself from there. It was quick. It was easy, and it has performed. The best part is that it saved me money from having to purchase a whole new system. I’m very happy with my purchase. I believe it was money “well spent”, and I can highly recommend this Purple hard drive, with confidence. Thank you, Western Digital, for producing a quality product

### ⭐⭐⭐⭐⭐ Does what it’s supposed to. Still doing it.
*by E***E on November 24, 2025*

This bad boy is still trucking along in our security system since purchase. Does what it’s supposed to. Fairly quick remote viewing response, fairly low noise, zero downtime. Work horse.

### ⭐⭐⭐⭐⭐ Always use the purple for security systems
*by L***S on November 30, 2025*

Great hard drives. I use these in all of my security system deployments. Only had 1 bad drive out of all the ones I’ve ordered and they replaced it quickly and without hassle. They are great prices for an outstanding drive.

## Frequently Bought Together

- Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD42PURZ
- Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD43PURZ
- Western Digital 10TB WD Purple Pro Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5" - WD101PURP

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-23*