Our Take
The Seagate Expansion Portable 4TB is a bus-powered 2.5-inch external hard drive aimed at everyday users who need straightforward, high-capacity storage without fuss. It sits at the budget end of the portable drive market, trading raw speed for affordability and generous capacity, making it a practical choice for backups, media libraries, and file transfers rather than performance-critical tasks.
Key Features
4TB storage capacity in a 2.5-inch form factor
USB 3.0 interface (backwards compatible with USB 2.0)
Bus-powered via USB — no external power supply required
Compatible with both Windows PCs and Macs out of the box (formatted for Windows; Mac users will need to reformat or use third-party software)
Includes 2 years of Seagate Rescue Data Recovery Services, covering accidental deletion and drive failure
Model number STKM4000400
Our Verdict
A sensible, no-nonsense pick for PC users who want affordable high-capacity backup storage and aren't moving files constantly. If you're regularly transferring large files, working on the move, or using a Mac as your primary machine, a portable SSD would serve you considerably better.