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Western Digital WDBFJK0040HBK-NESN Hard Drives Wd 4tb My Book Desktop         Ext - External Hdd Usb 3.0 Black (wdbfjk0040hbk-nesn) Wdbfjk0040hbknesn 999555416735
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Product Specifications



Wd 4tb My Book Desktop Ext - External Hdd Usb 3.0 Black (WDBFJK0040HBK-NESN)

WD 4TB MY BOOK DESKTOP EXT - EXTERNAL HDD USB 3.0 BLACK

Manufacturer Part Number: WDBFJK0040HBK-NESN

4TB My Book Desktop Storage. Secure your precious memories on My Book desktop storage. This USB 3.0 drive is optimized for the fastest possible data transfer rates and provides a complete backup solution with automatic backup, cloud backup and system-level backup to protect your precious memories and your critical system files. Password protection with hardware encryption keeps your private stuff private.



CPN:WD 4TB MY BOOK DESKTOP EXT - EXTERNAL HDD USB 3.0 BLACK
MANUFACTURER NAME: Western Digital
MANUFACTURER PART NUMBER: WDBFJK0040HBK-NESN
UPC EAN CODE: 999555416735
LANGUAGE: EN
MARKET:US

General Information:

Ultra-fast transfer rates

My Book desktop storage is optimized for the best possible data transfer rates. Connect this drive to a SuperSpeed USB 3.0 port to save and access files up to 3x faster than with USB 2.0.

System-level backup

Acronis® True Image WD Edition is an integrated software suite that ensures security of all information on your PC. It can back up the entire disk drive or selected partitions, including your operating system, applications, settings and all of your data. You can also use the software to securely delete any confidential data you no longer need.

ManufacturerWestern Digital Corporation
Manufacturer Part NumberWDBFJK0040HBK-NESN
Manufacturer Website Addresshttp://www.wdc.com
Brand NameWD
Product LineMy Book 3.0
Product NameMy Book 4TB
Product TypeHard Drive
  Product UPC999555416735
Technical Information:
Storage Capacity4 TB
Platform SupportedMac
PC
Interfaces/Ports:
Host InterfaceUSB 3.0
Physical Characteristics:
Drive TypeExternal
External Drive TypePortable
Height6.7"
Width1.9"
Depth5.5"
Weight (Approximate)2.27 lb

What Can Your Device Hold?

Desktop HDD

1Photos based on a 10-Megapixel camera producing images 5MB in size
2Songs based on average length of 4 minutes, 4MB size
3HD video based on 720p or 1080i video
4Blu-ray HD Movie was calculated at 16.2Gb per hour recording rate

Date Inserted: Wednesday March 11, 2026

This product was last updated on Thursday April 23, 2026

All products are brand new and factory sealed unless otherwise stated.
 *** Disclaimer- Information is supplied by the Manufacturer. The image, including color, may differ from actual product appearance. CompSource, Inc. is not responsible for data. ***

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(Delivery within 2-7 business days)

Two Day Air = $25.00
(Delivery within 2 business days)

Standard One Day = $35.00
(Delivery within next business day)

Priority = $45.00
(Delivery within next business morning)

U.S Mail Priority (AA,AE,AP only) = $30.00

FedEx International Economy (Canada only) = $85.00

Typically out of stock items are filled within 1 to 14 business days but can and may take longer.

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For support on this product, please contact Western Digital. 714-932-5000 WWW.WESTERNDIGITAL.COM


Western Digital Company's Information

Western Digital  
Click Western Digital for all products

Local #: 714-932-5000

Toll Free #: 714-932-5000

Tech Support #: 800-832-4778

Site:  WWW.WESTERNDIGITAL.COM

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    About Western Digital

    Innovating at the Boundaries of Technology
    Whether in your pocket, home, car, or the cloud, its likely Western Digital is with you every step of the way. It's a responsibility we don't take lightly. That's why we are always at the cusp of innovation, pushing the boundaries of technology to make what you thought was once impossible, possible.

    Western Digital has long been at the forefront of game changing innovations. From the invention of the first hard drive to recent advancements in 3D NAND our journey of innovation continues to inspire those who dare to think big about the possibilities of data.

    Here are some of the most popular categories for Western Digital;





    Learn more about Hard Drives

    Everything You Want to Know About Hard Drives.

    Understanding hard drive basics will help you make better storage decisions.

    What's a Hard Drive Do?
    A hard drive is the hardware component that stores all of your digital content. Your documents, pictures, music, videos, programs, application preferences, and operating system represent digital content stored on a hard drive. Hard drives can be external or internal.

    Everything stored on a hard drive is measured in terms of its file size. Documents (text) are generally very small whereas pictures are large, music is even larger, and videos are by far the biggest. A hard drive determines the size of digital files in terms of megabytes (MB), gigabytes (GB), and terabytes (TB).

    There are 3 major versions of hard drive technologies. All of them have pros and cons and reasons for owning each versions;

    Standard Hard Drives

      This is an older technology but has continued to evolve in speed and reliability. Basically the technology is like a record player except the platters are metal instead of vinyl and the needle is magnetic allowing you to read, write and erase. The faster the hard drive spins, or RPM, the faster the read and write happens.
      Pros -- Cheapest per GB, very reliable and easily replaceable.
      Cons -- Much slower than newer technologies.

    Solid State or SSD Drives

      Solid State is basically a form of memory that can be written to and the data will stay saved even with the power off!
      Pros -- Very Fast read/write, no moving parts so it is quiet and in theory should last longer, less heat and energy.
      Cons -- Price per GB is more expensive than Standard HDD.

    M.2 Drives

      An M.2 SSD is a solid-state drive (SSD) that conforms to a computer industry specification written for internally mounted storage expansion cards of a small form factor. Shaped like a stick of gum. Most M.2 SSDs are 80 x 22mm (L x W), but they can be shorter or longer. You can tell what size an M.2 SSD is by reading the four or five-digit number in its name: the first two numbers are its width, while the others are its length (example: M.2 Type-2280).
      Pros -- Small for factor and SPEED,!!! M.2 card can use either the existing SATA 3.0 specifications and be restricted to the 600MB/s or it could instead elect to use PCI-Express that provides a bandwidth of 1GB/s under the current PCI-Express 3.0 standards.
      Cons -- Compatibility, since this is an internal storage device your motherboard must be newer and include the proper slot(s) to accommodate this storage technology.

    Hybrid Hard Drives

      A Hybrid Hard Drive may be the best of both worlds. In a Hybrid Drive you have both SSD and Platter or Standard Hard Drives included in one device. Typically you have a smaller SSD Drive coupled with a larger HDD. You have the low price per GB of an HDD and the speed of an SSD. This type of drive is a great choice for SMB workstations all the way to gaming machines.
      Pros -- Best overall value for the dollar as well as speed ratio.
      Cons -- Can add a level of complexity to some users as you basically have 2 drives in one and will have to be aware of what drive you will save data vs programs to.

    If you have an older Computer or notebook consider the SSD option as it will make your system feel new again with this faster storage technology.

    Internal vs. External or Portable Hard Drives

    External desktop hard drives are built using a drive and require an AC adapter plugged into a power outlet. These drives are a good choice for supplementing a desktop computer or plugging into a laptop's home base, and typically can extend your need to upgrade your hard drive or more importantly it can be used as a backup drive. As the saying goes "It's not if, but when something fails!" Please Backup...



    CompSource wants this to be as easy and stress-free as possible.

    We're here to help you decide. Chat with us or give our professionals a quick phone call (800)-413-7361, we can assist with the best solution for your needs and budget.



    Quick delivery of what I ordered. Very satisfied. larry
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