Seagate Expansion STNN4000400 External Hard Drive

4 TB · Portable

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Capacity 4 TB
Type Portable

Seagate Expansion STNN4000400 External Hard Drive is a 4 TB portable hard drive powered over USB. Good for backups and big files; for games and editing an SSD is much faster. It came out in 2026.

Released: 2026-01-07

Specifications

Key specs

Capacity: 4 TB
Type: Portable
Released: 2026-01-07
Part number: STNN4000400
EAN / UPC: 8719706046541

Hard drive

HDD capacity: 4 TB
HDD size: 2.5"

Ports & interfaces

USB connector: USB Type-C

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Features

Product colour: Black
Windows operating systems supported: Yes
Mac operating systems supported: Yes

Power

Bus powered: USB

Weight & dimensions

Width: 85 mm
Depth: 117.8 mm
Height: 20.9 mm
Weight: 246 g

Other features

Quick start guide: Yes

Check the manufacturer's page before buying.

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About this product

Carry your digital world in your pocket with the Expansion portable 2.5-inch external hard drive. Sleek and lightweight, it delivers flexible and secure storage for photos, media and everyday files. Easy to use and ready when you are, it features plug-and-play usability, universal connectivity and Rescue Data Recovery Services. Keep everything that matters close, wherever you go. Built to move with you Personal, everyday storage for moments that make you. Storage with benefits Here’s what makes Expansion portable essential for everyday storage. Room for it all Up to 4 TB of space for photos, videos and everything worth keeping. No fuss. Just storage. Easy everyday storage that’s simple to set up and use. Made to move Portable, light and compact. Ideal for home, school, work, or travel. Very compatible Works with most Windows® and macOS® systems for use across devices. Plays well with others USB-C connectivity makes it easy to connect to today’s devices. Easy on the eyes Sleek and modern design that fits any vibe. Refreshingly obvious Storage shouldn't feel complicated.

Datasheet (PDF)