Description
Overview
The Seagate Expansion Portable 4TB (model STKM4000400) is a compact 2.5-inch external hard drive that provides large-capacity, bus-powered storage for laptops and desktops. It ships preformatted in exFAT for immediate use with Windows and macOS, and connects via a USB 3.0 (USB 3.2 Gen 1) Type-A interface for fast transfers when paired with a compatible port.
Key features
- 4TB storage capacity in a lightweight 2.5″ portable enclosure
- USB 3.2 Gen 1 (USB 3.0) — micro-B port, backward compatible with USB 2.0
- Preformatted exFAT for cross-platform use (reformatting required for Time Machine backups)
- Includes an 18-inch (≈45.7 cm) USB 3.0 cable (USB-A to USB 3.0 micro-B)
- Seagate Rescue Data Recovery Services included (terms apply)
- Regional limited warranty (see Seagate for details)
Compatibility & support
The drive works with most Windows, macOS and Chrome OS systems. For Time Machine backups on macOS you may need to reformat. The product is supported by Seagate documentation and downloadable firmware/tools; warranty length and service terms vary by region.
What’s in the box
- Seagate Expansion portable hard drive (4TB)
- USB 3.0 cable (USB-A to USB 3.0 micro-B), ~18 inches / 45.7 cm
- Quick start guide







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