Key Specs
- Storage Drive Type: HDD (Traditional, mechanical hard disk drives are the most common type of storage because they're relatively inexpensive and offer huge capacities. However, they also generate both noise and heat. Solid state drives, also known as SSDs, are many times faster than hard disk drives and have no moving parts to wear out, but typically offer less capacity for the same price.)
- Interface(s): USB 3.0 (Refers to the types of connections that devices use to interact and communicate with each other.)
General
- Product Name: My Book Duo 4TB External USB 3.0/2.0 Hard Drive
- Brand: WD
- Model Number: WDBLWE0040JCH-NESN
Performance
- Storage Drive Type: HDD (Traditional, mechanical hard disk drives are the most common type of storage because they're relatively inexpensive and offer huge capacities. However, they also generate both noise and heat. Solid state drives, also known as SSDs, are many times faster than hard disk drives and have no moving parts to wear out, but typically offer less capacity for the same price.)
Compatibility
- Internal Or External: External
- External Hard Drive Type: Desktop (Physical characteristics of the hard drive, including size, weight and how you connect to your device.)
- Interface(s): USB 3.0 (Refers to the types of connections that devices use to interact and communicate with each other.)
- Minimum System Requirements: Windows 10, Windows 8.1/8.0 or Windows 7, macOS Sierra (10.12), El Capitan (10.11), Yosemite (10.10), or Mavericks (10.9) operating systems (reformatting required)
Features
- Security Features: Software
- Data Encryption: true
- Encryption Algorithm: 256-bit AES (The algorithm standard used to encrypt data on a device.)
Dimensions
- Product Height: 6.5 inches (The out of box height of the item. Height is measured as the vertical distance from the bottom of the item to the top as it would be primarily used or placed.)
- Product Width: 3.9 inches (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
- Product Weight: 73.6 ounces (The out of box weight of the item.)
Included
- Included Software: WD SmartWare Pro, WD Drive Utilities, WD Security
Other
- UPC: 718037823669

Easily protect important files with this WD My Book Duo hard drive that features local and Cloud backup options and WD Security software for safe storage. The 4TB capacity offers ample space to house pictures, videos, music and more.

4TB capacity: Provides plenty of space to house pictures, videos, music, documents and other important files.
USB 3.0/2.0 interface: Allows simple connectivity.
Speeds up to 5 Gbps via USB 3.0 and up to 480 Mbps via USB 2.0: To ensure rapid data transfer.
256-bit AES hardware encrypted RAID: Promotes optimal performance.
Multiple data management options: Use the default performance mode (RAID 0) for rapid data transfers and maximum capacity. With safe mode (RAID 1), half the capacity is used to store your data, and the other half is used for a duplicate copy.
True hardware RAID: Provides an independent CPU to manage RAID volumes and maximize bandwidth, helping to reduce bottlenecks and improve data throughput.
WD SmartWare Pro software: Enables automatic local backup. Dropbox allows Cloud backup.
WD Security software: Helps keep stored data safe.
Compatible with PC: For use with your existing computer. The hard drive can also be reformatted for use with Mac OS X.

Whats Included

WD My Book Duo 4TB External USB 3.0/2.0 Hard Drive
USB cable, AC adapter, WD SmartWare Pro, WD Drive Utilities and WD Security software
Owner's manual

Q: Can a Mac be backed up on one drive and a Windows on the other?

A: Yes, this can be used that way.

Q: How many computers and tablets can backup data on this device

A: Absolutely- multiple devices as well as mobile apps: I have iPad/iPhone devices, and WD has an app for that.

Customers are saying

Customers have good things to say about the My Book Duo 4TB External USB 3.0/2.0 Hard Drive. They appreciate its reliable backup capabilities, which gives them peace of mind in securing their important photos and files.

This summary was generated by AI based on customer reviews.

The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.

Rated 5 out of 5 stars
Perfect for important data and security
In duo mode, I can have two drives backing each other up, and feel very secure that my family photos, important documents and video archives are well cared for, with identical copies on two hard drives. Other WD models are network devices, which you might consider, but know that they can take longer to do a full backup, or you might not have a home/work Ethernet infrastructure. Plus, as a USB device, you can backup on a regular schedule and leave this OFF your network to eliminate the risk of hackers getting all your important files. I like that the hard drives are individually replaceable, should one ever fail. The key drawback is that with USB, you have to be the one to discipline yourself to back up regularly, unless you keep it connected all the time.
Posted 10 years ago by CustomWebProgrammer
Rated 4 out of 5 stars
Great deal for the price
I purchased this drive to back up my DJ library. This ended up being a good purchase as it runs quietly and has ample space for me to back up the entire library I also like that the drives can be mirrored so there's always two copies of what's on the drive. I've always had good luck with western digital as they make great products
Posted 8 years ago by DJP01
Rated 4 out of 5 stars
Great Raid 1
Returned because i needed the MyCloud version. Other than that no issues. Thanks
Posted 10 years ago by Phillyfish