The Seagate® Expansion portable hard drive is the perfect external drive for quick and easy storage expansion. Featuring a sleek, compact design, this portable hard drive offers 4 TB of additional space, making it ideal for storing large files, photos, videos and more. It’s ready to use right out of the box with no software to install. Simply drag and drop your files. Compatible with both Windows® and Mac®, it seamlessly integrates with your devices. Plus, USB 3.0 ensures fast data transfer speeds, so you can back up your digital life effortlessly. Whether you’re at home or on the go, the Seagate Expansion portable hard drive provides reliable, on-the-fly storage and the Seagate quality you trust.
Details
- Sleek and simple design means this portable drive is perfect for transporting photos, movies, music and more everywhere
- Drag-and-drop file saving
- Seamless connection to devices running Chrome® OS, levelling up your digital life
- Automatic recognition of Windows and Mac computers for simple setup (reformatting required for use with Time Machine)
- Peace of mind with included limited warranty and Rescue Data Recovery Services
- Get an extra layer of protection for your data with the included 3 year Rescue Data Recovery Services.
- Sleek and simple portable drive design for taking photos, movies, music, and more on-the-go
- Automatic recognition of Windows and Mac computers for simple setup (Reformatting required for use with Time Machine)
- Drag-and-drop file saving
- USB 3.0 powered
Key Specs
Capacity - 4TB
Dimensions: L x W x D115.3mm/4.539in × 80.0mm/3.149in × 20.9mm/0.823in
Weight- 257g/0.567lb
System Requirements
- Compatible with most Windows, macOS and Chrome OS systems. Visit seagate.com/os for details.
- USB 3.0 port (required for USB 3.0 transfer speeds)2
What's Included
- Seagate® Expansion portable hard drive
- 18 inch (46 cm) USB 3.0 cable
- Quick Start Guide
- Limited Warranty: 3 years
- Rescue Data Recovery Services3
Plug-in Instant Storage
Add extra storage in seconds with Seagate Expansion drives.
- Drag and drop file saving, right out of the box
- Fast data transfer with USB 3.0 connectivity
- Compatible with Windows, Mac and Chromebook

Easy, Instant Storage Expansion
Expand your storage instantly with Seagate Expansion portable drives. These easy-to-use external hard drives boost your available space with a simple plug-and-play connection. Once connected, quickly save files with drag-and-drop functionality. Ideal for both professional and personal use, these external drives let you transfer digital files in seconds — even large media files like videos and images. Seagate Expansion portable drives make expanding your storage effortless and efficient.

Lightning-Fast File Transfer Speed
Experience unmatched efficiency with Seagate Expansion portable drives, designed for those who value speed. Equipped with USB 3.0 technology, these drives deliver ultra-fast data transfer rates, allowing you to move large files in seconds. Whether you’re backing up important documents, transferring high-resolution images, or relocating extensive video files, the Seagate Expansion portable hard drive ensures your data is transferred swiftly and securely. Say goodbye to long wait times and enjoy seamless, high-speed performance that keeps your workflow uninterrupted.

System Compatibility and Device Requirements
The Seagate Expansion portable drive offers seamless compatibility with Windows, MacOS and ChromeOS. It works right out of the box (no software required) — just plug it in. The drive’s USB 3.0 interface also supports USB 2.0, making it versatile across various devices. Whether you’re using a desktop or laptop, the Seagate Expansion portable hard drive easily integrates into your setup.

Robust Durability and Premium Build Quality
Offering robust durability in a sleek design, the Seagate Expansion portable drive is built to last. Its sturdy construction protects your data from everyday bumps and drops, ensuring long-lasting performance. Whether you’re on the go or working in a busy environment, this hard drive is engineered to keep your files secure with reliable storage you can trust.
Click here for more information on Seagate’s unique product quality assurance methodology.

Rescue Data Recovery Services
We’ve Got Your Back
Rest easy knowing our Rescue Data Recovery Services will shield you from data loss and recovery costs in the event of the unexpected, like water damage or a natural disaster.¹
Learn More
Choose Your Expansion Drive
Product Information
Digital Storage Capacity |
4000 GB |
Hard Disk Interface |
USB 2.0/3.0 |
Connectivity Technology |
USB |
Brand |
Seagate |
Special Feature |
Portable, Sleek, Drag and Drop, Automatic Recognition |
Hard Disk Form Factor |
2.5 Inches |
Hard Disk Description |
Mechanical Hard Disk |
Compatible Devices |
Laptop, Desktop |
Installation Type |
External Hard Drive |
Colour |
Black |
Item details
Brand Name |
Seagate |
Model Number |
STKM4000400 |
Hard Disk Type |
Mechanical Hard Disk |
Box Contents |
Seagate® Expansion portable hard drive, 18-inch (45.72cm) USB 3.0 cable, Quick start guide, Limited Warranty: APAC - 3 years, Rescue Data Recovery Services |
Manufacturer |
Seagate Technology (Thailand) Limited. India Customer Care No: 18003092525, Seagate |
Global Trade Identification Number |
10763649160487 |
UPC |
763649160480 |
User guide
Installation Type |
External Hard Drive |
Measurements
Hard-Drive Size |
4 TB |
Item Weight |
0.4 Pounds |
Item Dimensions L x W x Thickness |
11.7L x 8W x 1.5Th Centimeters |
Number of Items |
1 |
Unit Count |
4 Count |
Features & Specs
Digital Storage Capacity |
4000 GB |
Hard Disk Interface |
USB 2.0/3.0 |
Network Connectivity Technology |
USB |
Product Features |
Portable, Sleek, Drag and Drop, Automatic Recognition |
Hard Disk Form Factor |
2.5 Inches |
Compatible Devices |
Laptop, Desktop |
Hard Disk Rotational Speed |
5400 RPM |
Specific Uses For Product |
Personal |
Read Speed |
120 Megabytes Per Second |
Media Speed |
120 |
Cache Memory Installed Size |
4 |
Data Transfer Rate |
600 Megabytes Per Second |
Form Factor |
2.5-inch |
Hardware Connectivity |
USB 3.0 |
Additional details
Colour |
Black |
Enclosure Material |
plastic |