Seagate

Seagate Expansion 320 GB USB 2.0 Portable External Hard Drive ST903204EXA101-RK

Name: Seagate Expansion 320 GB USB 2.0 Portable External Hard Drive ST903204EXA101-RK
Brand: Seagate
SKU: B001SJZV10

Status: Seagate Expansion 320 GB USB 2.0 Portable… (320GB hard drive): Unavailable on Amazon as of 2026-10-21 22:26 UTC. Closest in-stock match (same 320GB hard drive): Ultra Slim Portable External Hard Drive USB 3.0…, $25.99 on Amazon as of 2026-10-21 04:20 UTC (price may vary). eBay sellers may still list this model new or used.

View Current Price — $25.99 🛒 Search eBay for this model

Bottom line: The Seagate Expansion 320 GB USB 2.0 Portable External Hard Drive: Bus-powered over USB 2.0 - no AC adapter to carry; main trade-off: USB 2.0 caps transfers around 480 Mbps, slow by modern standards.

Unavailable on Amazon as of 2026-10-21 22:26 UTC

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Currently unavailable on Amazon. Not the same product — 3 in-stock alternatives with matching specs:

Same 320GB hard drive: Ultra Slim Portable External Hard Drive USB 3.0… — $25.99 on Amazon as of 2026-10-21 04:20 UTC (price may vary).

View Current Price — $25.99

Same 320GB hard drive: Maxone 320GB Ultra Slim Portable External Hard… — $28.19 on Amazon as of 2026-10-21 04:15 UTC (price may vary).

View Current Price — $28.19

Same 320GB hard drive: Aiolo Innovation 320GB External Hard Drive Ultra… — $29.97 on Amazon as of 2026-10-21 04:15 UTC (price may vary).

View Current Price — $29.97

Original listing (currently unavailable) → Compare to similar external storage

By Mike Perry, Founder & Editor-in-Chief · Listing data updated 2026-10-21

Mike Perry — Hardware researcher since 2014. For external drives and portable storage, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference. About the author →

Pros & Cons

Pros

✓ Bus-powered over USB 2.0 - no AC adapter to carry
✓ Auto-recognized by Windows, zero software install
✓ Built-in power management spins down when idle
✓ Drag-and-drop file saving, no backup app required

Cons

✗ USB 2.0 caps transfers around 480 Mbps, slow by modern standards
✗ 5400 RPM spindle lags 7200 RPM and SSD alternatives
✗ 320 GB is small next to current multi-TB portables
✗ Mechanical platter drive - less drop-tolerant than SSDs

Manufacturer description

The Seagate Expansion ST903204EXA101-RK is a 320 GB USB 2.0 portable hard drive built for people who need extra space that travels. At 5400 RPM, it targets file archiving, photo libraries, and document backup rather than high-speed video editing, and the single-cable design means it draws power straight from your computer's USB port with no separate AC adapter to pack. Windows recognizes the drive automatically, so there is no software to install and nothing to configure. You drag, you drop, you are done. Built-in power management spins the drive down when it is idle, which matters when you…

SpecPicks Verdict

SpecPicks scored Seagate Expansion 320 GB USB 2.0 Portable External Hard Drive using a rating × review-volume × price-fit model applied to published specs and reviews across the external storage category. Seagate's external storage lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for external storage of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Does the Seagate Expansion 320 GB need a separate power adapter?

No. The drive is USB 2.0 powered, drawing everything it needs from the single USB cable, so there is no external power supply to pack or plug in.

How fast is this drive?

It pairs a 5400 RPM mechanical spindle with a USB 2.0 interface, so real-world throughput is well below USB 3.0 or SSD portables. It suits backup and file transport rather than editing from the drive.

Do I need to install software to use it?

No. Seagate lists it as plug-and-play with no software to install and nothing to configure. Windows recognizes the drive automatically and you save files by drag-and-drop.

Will it work with a Mac?

The product features call out automatic recognition by Windows. Mac compatibility depends on the drive's format, so check the product listing for current OS support before buying.

Is 320 GB enough storage for me?

It holds roughly a large photo and document library, but it is modest against today's multi-terabyte portables. If you are archiving video, size up; if you need a lightweight travel backup, 320 GB works.

Key Features

Plug n¿ play with no software to install
Simply drag-and-drop to save files
5400 RPM performance, 320GB
Built-in power management ensures energy-efficient operation
USB 2.0 Powered

Full Specifications

ASIN	B001SJZV10
Brand	Seagate
Cache Size	8
Item Weight	10.4 ounces
Manufacturer	Seagate Hard Drives
Model Number	ST903204EXA101-RK
Hard Disk Size	320 GB
Installation Type	External Hard Drive
Item model number	ST903204EXA101-RK
Compatible Devices	Desktop
Product Dimensions	5.56 x 3.15 x 0.69 inches
Hard Disk Interface	USB 1.1
Date First Available	February 18, 2009
Hard Disk Description	Portable
Digital Storage Capacity	320 GB
Specific Uses For Product	Personal
Hard Disk Rotational Speed	5400 RPM
Is Discontinued By Manufacturer	No

Ready to buy?

Amazon shows no buyable offer for Seagate Expansion 320 GB USB 2.0 Portable… at the last check. The closest in-stock match with the same 320GB hard drive is Ultra Slim Portable External Hard Drive USB 3.0…. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

View Current Price — $25.99