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Seagate Expansion Portable Hard Drive USB 3.2 Gen 1 (3.1 Gen 1)

The Seagate Expansion Portable Hard Drive USB 3.2 Gen 1 (3.1 Gen 1) is a compact 2.5" bus-powered drive designed for travellers and everyday users who need to carry large files between their PC, Mac, or Chromebook without carrying a power adapter. It connects instantly with no software or drivers required, and every unit includes Seagate Rescue Data Recovery Services for added confidence.

Why This Product

Plug-and-play, no drivers needed — It connects via USB and is recognised immediately by Windows, macOS, and ChromeOS — no software installation required.
Bus-powered — no power brick — It draws power directly from the USB port, so there is nothing extra to pack or plug in when you travel.
Cross-platform out of the box — It arrives preformatted in exFAT, which both Windows and macOS can read and write without reformatting.
USB 3.0 with USB 2.0 fallback — The USB 3.2 Gen 1 interface also works with older USB 2.0 ports, so it is compatible with a wide range of existing hardware.
Rescue Data Recovery Services included — Every unit ships with access to Seagate's Rescue Data Recovery Services at no extra cost (availability varies by country).
18-inch cable in the box — A 45.72 cm USB 3.0 cable is included, so it is ready to use straight from the packaging.

At a Glance

1 TB - STKM1000400

Capacity	1 TB
Drive Type	HDD (SMR)
Interface	USB 3.2 Gen 1 (USB 3.0); backwards compatible with USB 2.0
Form Factor	2.5"
Dimensions	115.3 × 80.0 × 12.6 mm
File System	exFAT
Warranty	1 yr (AMER) / 2 yr (EMEA) / 3 yr (APAC)

2 TB - STKM2000400

Capacity	2 TB
Drive Type	HDD (SMR)
Interface	USB 3.2 Gen 1 (USB 3.0); backwards compatible with USB 2.0
Form Factor	2.5"
Dimensions	115.3 × 80.0 × 12.6 mm
File System	exFAT
Warranty	1 yr (AMER) / 2 yr (EMEA) / 3 yr (APAC)

4 TB - STKM4000400

Capacity	4 TB
Drive Type	HDD (SMR)
Interface	USB 3.2 Gen 1 (USB 3.0); backwards compatible with USB 2.0
Form Factor	2.5"
Dimensions	115.3 × 80.0 × 20.9 mm
File System	exFAT
Warranty	1 yr (AMER) / 2 yr (EMEA) / 3 yr (APAC)

5 TB - STKM5000400

Capacity	5 TB
Drive Type	HDD (SMR)
Interface	USB 3.2 Gen 1 (USB 3.0); backwards compatible with USB 2.0
Form Factor	2.5"
Dimensions	115.3 × 80.0 × 20.9 mm
File System	exFAT
Warranty	1 yr (AMER) / 2 yr (EMEA) / 3 yr (APAC)

Compatibility

✓ Windows 10, Windows 8, and Windows 7
✓ macOS (any version that supports exFAT and USB storage)
✓ ChromeOS
✓ Any host with a USB 3.0 / USB 3.2 Gen 1 port for full-speed operation
Note: USB 2.0 ports are supported through backwards compatibility, but transfer speeds will be limited to USB 2.0 rates
Note: Rescue Data Recovery Services are not available in all countries — check Seagate's regional terms before relying on this benefit

Best For / Trade-offs

Best for:

Travellers and commuters who need to carry large files between machines without bringing a power adapter
Mixed-OS households or workplaces that need a drive readable by both Windows and macOS straight out of the box
Users who want simple setup — no drivers, no software, just plug in and go
Anyone who values data recovery cover at no additional cost, with Rescue Data Recovery Services bundled in
Chromebook users who need external storage that is officially compatible with ChromeOS

Trade-offs:

Users needing fast transfer speeds — this is a 5400 RPM HDD, not an SSD, so sequential throughput is far below what a solid-state drive provides
Workloads that depend on low latency — HDD seek times are significantly slower than NVMe or SATA SSD alternatives
Users who need a higher-capacity portable drive in the thinner 12.6 mm profile — the 4 TB and 5 TB variants are 20.9 mm tall, noticeably thicker than the 1 TB and 2 TB options (4 TB - STKM4000400, 5 TB - STKM5000400 only)
Buyers in AMER who want a longer warranty — the warranty in the Americas is 1 year, compared to 2 years in EMEA and 3 years in APAC

Description

The Seagate® Expansion portable drive is compact and perfect for on-the-go. Instantly add more storage space to your PC or Mac and take large files with you when you travel.

Plus, Seagate Expansion comes with Rescue Data Recovery Services for additional peace of mind.

Specifications

1 TB - STKM1000400

General

Brand	Seagate
Model Number	STKM1000400
Colour	Black
File System (Out of Box)	exFAT
What's in the Box	Expansion portable hard drive, 18-inch (45.72 cm) USB 3.0 cable, Quick start guide

Drive

Capacity	1 TB
Drive Type	HDD (SMR — Shingled Magnetic Recording)
Form Factor	2.5"
Rotational Speed	5400 RPM
Connector	USB Micro-B

Performance

Interface	USB 3.2 Gen 1 (USB 3.1 Gen 1 / USB 3.0); backwards compatible with USB 2.0
OS Compatibility	Windows 10, Windows 8, Windows 7; macOS; ChromeOS

Power & Environment

Power	Bus-powered via USB — no external power supply required
Height	12.6 mm
Width	80.0 mm
Length	115.3 mm

Reliability

Warranty	1 year (AMER) / 2 years (EMEA) / 3 years (APAC)
Included Services	Rescue Data Recovery Services (not available in all countries)

2 TB - STKM2000400

General

Brand	Seagate
Model Number	STKM2000400
Colour	Black
File System (Out of Box)	exFAT
What's in the Box	Expansion portable hard drive, 18-inch (45.72 cm) USB 3.0 cable, Quick start guide

Drive

Capacity	2 TB
Drive Type	HDD (SMR — Shingled Magnetic Recording)
Form Factor	2.5"
Rotational Speed	5400 RPM
Connector	USB Micro-B

Performance

Interface	USB 3.2 Gen 1 (USB 3.1 Gen 1 / USB 3.0); backwards compatible with USB 2.0
OS Compatibility	Windows 10, Windows 8, Windows 7; macOS; ChromeOS

Power & Environment

Power	Bus-powered via USB — no external power supply required
Height	12.6 mm
Width	80.0 mm
Length	115.3 mm

Reliability

Warranty	1 year (AMER) / 2 years (EMEA) / 3 years (APAC)
Included Services	Rescue Data Recovery Services (not available in all countries)

4 TB - STKM4000400

General

Brand	Seagate
Model Number	STKM4000400
Colour	Black
File System (Out of Box)	exFAT
What's in the Box	Expansion portable hard drive, 18-inch (45.72 cm) USB 3.0 cable, Quick start guide

Drive

Capacity	4 TB
Drive Type	HDD (SMR — Shingled Magnetic Recording)
Form Factor	2.5"
Rotational Speed	5400 RPM
Connector	USB Micro-B

Performance

Interface	USB 3.2 Gen 1 (USB 3.1 Gen 1 / USB 3.0); backwards compatible with USB 2.0
OS Compatibility	Windows 10, Windows 8, Windows 7; macOS; ChromeOS

Power & Environment

Power	Bus-powered via USB — no external power supply required
Height	20.9 mm
Width	80.0 mm
Length	115.3 mm

Reliability

Warranty	1 year (AMER) / 2 years (EMEA) / 3 years (APAC)
Included Services	Rescue Data Recovery Services (not available in all countries)

5 TB - STKM5000400

General

Brand	Seagate
Model Number	STKM5000400
Colour	Black
File System (Out of Box)	exFAT
What's in the Box	Expansion portable hard drive, 18-inch (45.72 cm) USB 3.0 cable, Quick start guide