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Seagate Expansion 4TB USB-C 2.5" Portable External Hard Drive STNN4000400 Black
- 4TB Storage Capacity: Plenty of room for photos, videos, media and everyday files.
- Compact & Portable: Slim, lightweight 2.5-inch design that fits easily in a pocket or bag.
- USB-C Connectivity: Includes a USB Micro-B to Type-C cable for easy connection to modern devices.
- Plug-and-Play Setup: Simple to set up and use; compatible with most Windows and macOS systems.
- Rescue Data Recovery Services: Includes 1 year of complimentary Seagate Rescue Data Recovery Services (availability may vary by region).
- What’s Included: Expansion portable hard drive, 0.5m USB Micro-B to Type-C cable, quick start guide, and 1-year limited warranty.
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Specs
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Learn more about the Seagate STNN4000400
| Brand | Seagate |
|---|---|
| Series | Expansion |
| Model | STNN4000400 |
| Part Number | STNN4000400 |
| Color | Black |
|---|---|
| Interface | USB Type-C |
| Capacity | 4TB |
| Features | Plug-and-play; USB-C connectivity; Compact, lightweight & portable; Rescue Data Recovery Services included |
|---|---|
| System Requirements | Compatible with most Windows and macOS systems |
| Usage | Portable storage for photos, videos, media and everyday files |
| Form Factor | 2.5" |
|---|---|
| Dimensions | 4.64" x 3.35" x 0.82" (117.8 x 85.0 x 20.9 mm) |
| Weight | 0.54 lbs |
| Package Contents | Expansion portable hard drive; 0.5m USB Micro-B to Type-C cable; Quick start guide |
|---|
| First Listed on Newegg | October 26, 2026 |
|---|
Warranty & Returns
Warranty, Returns, And Additional Information
Return Policies*
- Return for refund within: 30 days
- Returns are subject to restocking fees and return shipping fees. Please click here to learn more about restocking fees and return shipping fees.
- This item is covered by Newegg.com's International Order Return Policy.
- Read full return policy for details.
- *Subject to applicable law
Warranty Notice:
This product does not include manufacturer warranty when purchased or used outside of its designated sales region. By purchasing internationally, you acknowledge that warranty support from the manufacturer will not be available.
Manufacturer Contact Info
- Manufacturer Website
- Support Phone: 1-800-732-4283
- Support Website
- View other products from Seagate
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The Seagate Expansion STNN4000400 is a 4TB portable external hard drive for people who want roomy, plug-and-play storage for photos, videos, media, and everyday files. Its 2.5-inch design and included USB Micro-B-to-USB-C cable make it suited to carrying files between compatible Windows or macOS devices.
Recommended For
- Laptop owners who want to move photos, videos, and everyday files off a crowded computer and keep a portable local copy for occasional access.
- Photographers and video shooters who need a compact drive to carry or store large collections of finished photos and footage, rather than a fast drive for editing those files directly.
- Students and remote workers who carry a backup set of documents and media between home, campus, or work and prefer a plug-in storage drive over relying only on a laptop’s internal space.
- Home-computer users who want an external drive as one additional copy of important files; Seagate advises keeping another copy on separate media rather than treating one external drive as the only backup.
Real-World Use Scenarios
- When a laptop is running low on space, move older photos, videos, and everyday files onto the drive; this frees internal storage while keeping those files available when the drive is connected.
- For a simple computer backup routine, copy important documents and personal media to the drive periodically; it provides a separate local copy, though it should not be the only copy of important files.
- When moving between home, school, or work, carry a library of files with you and connect the drive to a computer; this makes stored files accessible without first uploading or downloading them.
- To keep a personal photo, video, or music collection outside a computer’s internal drive, store the files on the Expansion and connect it when needed; file transfers and browsing may feel less immediate than on an SSD.
- After finishing a photo or video project, move the original files or completed footage onto the drive for storage; for active editing where fast scrubbing and responsiveness matter, an SSD is generally a better fit.
Spec Summary
| Attribute | Value |
|---|---|
| Best For | Portable storage for photos, videos, media, and everyday files, including personal, business, and multimedia use |
| Capacity | 4 TB of storage |
| Interface And Connectivity | USB Type-C connection using USB 3.0; compatible device types include desktop computers, laptops, smartphones, and tablets |
| Read And Transfer Performance | Listed read speed of 120 MB/s and data transfer rate of 4,800 MB/s |
| Drive Mechanism | Mechanical hard drive with a listed rotational speed of 7,200 RPM |
| System Compatibility | Compatible with most Windows and macOS systems; listed hardware platforms are PC and Mac |
| Portability And Dimensions | 2.5-inch form factor; 4.64 × 3.35 × 0.82 inches (117.8 × 85.0 × 20.9 mm) and 0.54 lb |
| Package Contents | Portable hard drive, 0.5 m USB Micro-B to USB Type-C cable, and quick start guide |
| Model Identifiers | Seagate Expansion Portable, model and part number STNN4000400; black |