BUFFALO
USB 3.1 (Gen 1)/USB 3.0 External hard drive HDD HD – adu3 Series
*Price sourced from Amazon.com. Last updated 2026-06-06. Price and availability subject to change.
Bottom line: The USB 3.1 (Gen 1)/USB 3.0 External hard drive HDD HD – adu3 Series is a solid pick with broad community endorsement in the external storage category, priced around $193.00, rated 4.3★ across 33,938 verified Amazon reviews. A solid choice — worth comparing against one or two close alternatives first.
Capacity: 4.0TB; [Compatible models] USB3.1 (Gen1) /USB3.0/2.0 Windows PC and Mac equipped with a Type-A terminal, corresponding OS: Windows 10 / 8.1 / 7, Mac OS X 10.11 or later; [ compatible TV] sharp "Aquos", Sony "BRAVIA", Panasonic "VIERA", Hisense, Toshiba "REGZA", FUNAI, Orion, Mitsubishi Electric, LG Electronics, Hitachi "Wooo", PIXELA, DX antenna, Dion (of compatible models see manufacturer HP details); [connection standard] USB3.1 (Gen1) /USB3.0/2.0; [size] dimensions (width × height × depth): 114 × 33 × 171mm ※ body only (protrusion except), weight: about 900g; power: AC power…
SpecPicks Verdict
SpecPicks classifies Buffalo USB 3.1 (Gen 1)/USB 3.0 External hard drive HDD HD – adu3… as a solid pick with broad community endorsement in the external storage category, based on 33,938 verified Amazon reviews and our ranking model that weights rating × review-volume × price-fit. BUFFALO's positioning sits within the broader category mid-tier. Use the Compare tool to put it side-by-side with two or three close alternatives before clicking through to Amazon.
Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.
Pros & Cons
Pros
- ✓ Solid 4.3★ customer rating
- ✓ Large, well-vetted feedback pool (33,938 reviews)
- ✓ Backed by BUFFALO's warranty and support channels
- ✓ Ships via Amazon with Prime eligibility and the standard returns policy
Cons
- ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
- ✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified
Full Specifications
| ASIN | B07BK6696F |
|---|---|
| Brand | BUFFALO |
| Color | Black |
| Model Name | HD-AD4U3 |
| Read Speed | 10 Gigabytes Per Second |
| Form Factor | 2.5-inch |
| Item Weight | 0.9 Kilograms |
| Manufacturer | BUFFALO |
| Model Number | HD-AD4U3 |
| Built-In Media | Data Recovery Service, Protective Case/Bag |
| Hard-Drive Size | 4 TB |
| Number of Items | 1 |
| Special Feature | Portable |
| Customer Reviews | 4.34.3 out of 5 stars(33,767)4.3 out of 5 stars |
Ready to buy?
Buffalo USB 3.1 (Gen 1)/USB 3.0 External hard drive HDD HD – adu3 Series is available on Amazon with Prime shipping and the full Amazon returns policy. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-06-06. Price and availability subject to change.
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