Our take
The WD My Book 4TB is a desk-based option for a buyer who needs more space than a small portable drive and can leave the unit near an outlet. The exact suffix WDBFJK0040HBK-NESN is listed in black with USB 3.0 and USB 2.0 host connections and an AC adapter. This makes its main tradeoff straightforward: higher nominal capacity in exchange for a powered stationary setup. The old listing's Windows 8 and backup-software details are not current support promises, and the historic Amazon ASIN has not been mapped to a present exact offer.
A stationary archive with an outlet and a confirmed USB 3.0 or USB 2.0 host.
It is not a fit for a no-outlet workflow, a one-cable bus-powered setup, or a buyer who needs current backup software or active operating-system support confirmed.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- The exact listing maps -NESN model WDBFJK0040HBK-NESN to a black 4TB My Book configuration.
- USB 3.0 and USB 2.0 connections are both documented for the exact product listing.
- An AC adapter is listed, so the external power requirement is a clear setup factor rather than an assumption.
What to weigh up
- The adapter and desktop format make it less convenient to carry than bus-powered portable HDDs and SSDs.
- 4TB is nominal capacity; formatted usable space is lower and the product remains a single-drive archive.
- Old Windows and SmartWare/Acronis bundle descriptions do not establish current compatibility or download availability.
Specifications and exact model details
The key details
| Model covered | WDBFJK0040HBK-NESN |
|---|---|
| Advertised capacity | 4TB nominal capacity |
| Drive configuration | Black 3.5-inch desktop HDD |
| Host connection | USB 3.0 and USB 2.0; AC adapter listed |
Performance figures are manufacturer claims. Source checked October 14, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
Exact suffix and capacity matter
The saved exact-part listing identifies WDBFJK0040HBK-NESN as a black 4TB My Book. WD's support table maps the base model to 4TB and USB 3.0/2.0, while the retailer listing supplies the exact suffix and power details. Keep this drive distinct from other My Book generations and capacities. A 4TB nominal disk can hold a larger archive than the 500GB and 750GB portable products in the comparison, but available space is lower after formatting and any existing files. Confirm the full code on the drive before ordering from a broad search result. ([Office Depot exact-part listing](https://www.officedepot.com/a/products/220115/WD-My-Book-4TB-External-Hard/), checked 2026-10-14.)
USB 3.0 or USB 2.0 host
The listing names both USB 3.0 and USB 2.0. That provides a documented path for a compatible host in either generation, but the USB 2.0 path runs at that older interface's rate. The source's transfer-rate figures describe the interface modes and are not a measured result for a present drive. Check the computer port and cable before relying on a particular connection. Do not let a 5Gbps USB 3.0 ceiling stand in for a hard-drive benchmark; real file transfers depend on the host, workload, cable and condition of the individual disk.
Plan for a desk and power adapter
Office Depot lists an AC adapter for this My Book. That makes the external setup outlet-dependent and separates it from small drives that draw power from the computer's USB port. The 3.5-inch configuration is better planned as a stationary storage location with room for the drive and its cable than as a pocket backup. Confirm that the exact seller unit includes the correct adapter and that it works; the original listing does not prove what a current used or refurbished offer contains. If the task requires movement between locations without power, pick an explicitly bus-powered model instead.
Do not carry old software claims forward
The retailer page refers to Windows 8 and bundled WD SmartWare Pro and Acronis backup software. Those are old product-era descriptions. They do not establish current system support, an available download or a license that transfers with a used unit. Choose a supported backup tool independently, check the host filesystem, and keep another copy of important data. The model's 4TB capacity can hold a large library, but one external drive is not a complete backup plan and its condition cannot be inferred from its original product specifications.
Who should shortlist it
Shortlist the My Book when 4TB is useful, the work area has an outlet, and USB 3.0 or USB 2.0 fits the computer. Choose a portable drive when the storage must travel or work in places without an outlet. A listing's current price or stock is not included here, and historical ASIN B076B6HGNQ is not verified as the current exact offer. Use the tagged model search and check the precise suffix, adapter, cable, return terms and drive condition before putting the archive on it. This is a fit based on documented capacity and setup, not an assertion about reliability or value.
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Before you buy
Can the My Book run without an outlet?
The exact listing specifies an AC adapter. It is not a documented bus-powered configuration.
Does it support a USB 2.0 host?
The saved WD and exact-part listing identify USB 2.0 alongside USB 3.0. The USB 2.0 connection uses its own interface rate.
Are the old WD backup utilities current?
That is unknown. The listing's Windows 8 and software bundle are dated product-era details, not current support evidence.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Office Depot exact-part WD My Book listing ↗ — checked October 14, 2026.
- Office Depot listing; lines 17–41 identify model and 4TB; specifications lines 45–62 identify exact -NESN suffix, USB 3.0/2.0, black finish and AC adapter ↗ — checked October 14, 2026.
- MCA exact-part record; lines 86–88 identify the 3.5-inch desktop HDD configuration ↗ — checked October 14, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.