or
Sign in to turn on 1-Click ordering.
or
Amazon Prime Free Trial required. Sign up when you check out. Learn More
More Buying Choices
founderdirect Add to Cart
$99.99 + $4.99 shipping
Max_Sale Add to Cart
$105.85  & this item ships for FREE with Super Saver Shipping. Details
Eonline Add to Cart
$105.89  & this item ships for FREE with Super Saver Shipping. Details
Have one to sell? Sell yours here
or
Get up to a $26.75 Amazon gift card
Seagate USB 2.0 Portable External Hard Drive
Customer image from L Peralta

Seagate Expansion 640 GB USB 2.0 Portable External Hard Drive ST906404EXA101-RK

by Seagate
4.0 out of 5 stars  See all reviews (783 customer reviews)

Select

Capacity
error!
 
In Stock.
Sold by soundxpress and Fulfilled by Amazon. Gift-wrap available.
Only 9 left in stock--order soon.
Want it delivered Wednesday, May 30? Choose One-Day Shipping at checkout. Details

Frequently Bought Together

Seagate Expansion 640 GB USB 2.0 Portable External Hard Drive ST906404EXA101-RK + Case Logic VHS-101 Portable Hard Drive Case (Black) + Seagate Expansion 500 GB USB 2.0 Portable External Hard Drive ST905004EXA101-RK
Price For All Three: $187.46

Show availability and shipping details

Buy the selected items together

Technical Details

Capacity: 640 GB
  • The drive is powered from the USB cable, so there is no need for an external power supply.
  • Plus, it is automatically recognized by Window operating system, so there is no software to install and nothing to configure.
  • Saving files is easy too, just drag-and-drop.It's not just easy to use, but it's fast and energy efficient too.
  See more technical details

Product Details

  • Item Weight: 10.4 ounces
  • Shipping Weight: 10.4 ounces (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B002OJTR6I
  • Item model number: ST906404EXA101-RK
  • Average Customer Review: 4.0 out of 5 stars  See all reviews (783 customer reviews)
  • Date first available at Amazon.com: September 14, 2004

Product Description

Capacity: 640 GB

640GB External Portable Drive...Seagate external portable drives are compact and perfect for on-the-go. Instantly add more storage space to your computer and take large files with you when you travel. Setup is straight forward, simply connect a single USB cable and you are ready to go. The drive is powered from the USB cable, so there is no need for an external power supply. Plus, it is automatically recognized by Windows, so there is no software to install and nothing to configure. Saving files is easy too, just drag-and-drop. It's not just easy to use, but it's fast and energy efficient too. Enjoy fast data transfer speed with USB 2.0 connectivity and 5400 RPM drive performance. Built-in power management ensures energy efficient operation.


Customer Reviews

Most Helpful Customer Reviews
231 of 233 people found the following review helpful
Nice quiet drive easy to use December 18, 2009
Size Name:500 GB|Amazon Verified Purchase
---update at end---

I purchased this drive a few weeks ago and have been very pleased with it. The only junk it was the warranty registration program. Run it then delete it. Disk comes pre-formated for NTFS. I went ahead and did a quick format to get rid of the existing folders on it. The drive goes into standby mode after 5 minutes bye default. This is quickly remedied and set to your liking with free Seagate Manager program available on Seagates website. Also this program give you the ability to do backups, and computer syncs.

Pros -
Quiet drive
very fast
small and sleek
no power supply needed
only requires use of one usb port
Simple/Custom Backups with Seagate Manager
Sync Option with Seagate manager

Cons-
Goes into standby in 5 minutes by default. Easily changeable with Seagate Manager
Case Logic Compact Portable Hard Drive Case listed as an option to purchase with this is TOO SMALL for this drive. This is an issue with Amazon not the drive itself.

Overall I am very please with this drive I have used it on multiple laptops and pcs without issue. I would suggest this over the new WD essential drives that come pre-installed with a bunch of crapware.

------UPDATE--------- 12/17/2010
First Google seagate freeagent download select the Seagate link then select Free Agent GO link. File name is FreeAgentCN.ZIP

I have have used this drive for the last year still performs as well today as it did a year ago. This is still a great buy.
Was this review helpful to you?
1,066 of 1,102 people found the following review helpful
Size Name:500 GB|Amazon Verified Purchase
UPDATES IN THE LAST PARA

I have clarified a few things that other reviews had issues with and gave it a low rating.

For Starters: Since I use Both Mac & PC, I can 1000% say that it works on both these operating systems.

Some customers had issues with the drive going into sleep mode after 10 mins or so. Well, the copying process does not stop, just because the drive has gone into SLEEP mode.

You can take this SLEEP feature off by:

Process 1: Downloading a Free Seagate Manager program available on the Seagate website.
(I did not do this, I used process 2, described next)

OR

Process 2: Formatting the drive and remove the pre-installed Seagate software. Then the drive will NOT go to SLEEP Mode.

How to Format a Drive in Windows:
Plug the Drive --> Go to My Computer --> Right click on the Seagate icon--> Click "Format"

How to Format a Drive in Mac 10.4 or earlier:
Open Macintosh HD --> Click Applications --> Click Utilities --> Open "Disk Utility" --> Select the Seagate disk listed on the Left Side --> Click "Erase" tab --> Choose Volume Format to "MS-DOS" (I chose this so that I can use it on Windows & Mac).

(For the newer MAC 10.6.1 or later, I guess Format is : "Mac OS Extended (journaled)", as rightly pointed out to me by a learned customer IB...Thanks dude!)

Design: Compact & Sleek. Little bigger than the iPhone, but lighter than the iPhone (8GB)

Connection: NO A/C Power outlet needed. Only single USB port is needed, everything provided in the box. So you just take it out and plug it and use it.

Compatibility: Both PC & Mac. Although on the box it says "FOR PC", it was detected by my MAC and will work with both.

Size: Though it says 500GB, we get 465.35GB. And this is the case with most hard drives.

Speed: Forget about the specifics - it is FAST!!

Well worth your money, right!!!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~UPDATE~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Many customers have asking me why the format process did not work for their Mac?

The reason is, I have a Mac version 10.4.1 and I clarified that in the review.I guess there are a few changes for 10.6.1 and I added that too. If your MAC OS does not fit the description, the best way to start is by finding out OS version of your MAC & then search online on how to format it OR take it to an apple store.

Basically, the STEPS on how to format remain the SAME. But you might find some different Volumes Format based on your OS version. Volume Format will change as new Operating Systems (OS) keep sprouting.

When I bought this drive, there was not a single review which spoke about MAC Compatibility, let alone the other issues. But I took the risk and bought it for $100 or so.

Also, if you compare other reviews vs. mine. My review does not speak about how many songs I have on my drive, who gifted me this, how my life has changed with the new drive, how my office folks like it, how it fits in my pocket although the it is a trouser from my high school.

No offense, they are good individually. What I mean is....one review answer about plug n play....another spoke about light weight (by how much they didnt say)...another complained SLEEP issue...But none answered MAC compatibility, Format, Weight etc

My review has even answered everything that can happen with this drive. (Except that "What will happen if it breaks down" :P )
Was this review helpful to you?
362 of 376 people found the following review helpful
Single USB not enough July 30, 2010
Size Name:640 GB|Amazon Verified Purchase
I bought this drive for three reasons:
1. Large capacity in a small form factor,
2. The ability to power/access it from a single USB port,
3. It was on sale at Amazon for under $70.

I started using it on my laptop when it arrived yesterday and was impressed: small, and it worked well with the short standard mini-USB cable. Then last night I plugged it in to my desktop and went to transfer over my 400 GB movie directory. It kept failing after about 10 seconds, at which time Windows 7 would report that I had just attached it. My first thought was it was due to the "sleep" utility, so I downloaded and installed the Free Agent tool from Seagate and set the timeout to Never. Didn't make any difference. I then used the test tool in the utility software and the it reported a drive failure at about 8%, and said I should contact Seagate for an RMA. All my other small external drives (except for an ancient 30 GB) need a splitter USB cable: one end connects to the drive and the two other ends connect to the PC, using the extra USB port for power. As I had nothing to loose, I gave one of those cables a try - it works fine. So, it appears that the drive needs more power than my PC can provide on a single USB cable.

I'm tempted to send it back, but I'm off on vacation tomorrow and it is a perfect drive for that. I may contact Seagate when I get back - maybe my drive is bad?

- - - - Update - - -
It worked perfectly on my trip, and it was nice to have the space. I've now tried this drive on four PCs - my desktop, my father's desktop, and two laptops. It works fine with the single cable on all but my desktop. This is strange, as I've tried the on-board USB ports and the ports on two add-in cards (one as USB-2 with four ports, and the other a USB-3 with two ports) and the drive will only work if I use a USB splitter cable. So, I have to say that the experience I reported in this review is unusual, and I can understand why others report it works fine with the single cable.
Was this review helpful to you?
Most Recent Customer Reviews
Not as durable
This was working solidly for about 6 months. Now, 3 years later, it still works, but I have to hold it in my hand or in a certain position or it won't run. Read more
Published 3 days ago by No guarantees
Excellent!!
The product is excellent, I really recommend this item. fast ship and the product was send in perfect conditions. My rate for this product is a five star rate.
Published 5 days ago by felmco
Good Product
Good Product. Arrived just in time and works fine. The product fulfill all the expectations and correspond to the description.
Published 8 days ago by Pablo Moreno V
Works
It has been working for me as a backup drive for almost a year now and it's small. I haven't had any problems with it.
Published 8 days ago by Jesse
size for performance
i bought two 1TB hard drives before this one, for about 30 dollars cheaper and they were about a 3rd of the size. Read more
Published 15 days ago by jeremy
Seagate Expansion 500GB USB 2.0 Portable External Drive
Seagate Expansion 500GB USB 2.0 Portable External Drive is an inexpensive and quality product for computer use.
It is handy and extremely useful. Read more
Published 18 days ago by Carolyn P.B.
Very nice hardware... but...
I like everything about this device EXCEPT the TINY usb cable that comes with it--which is only about 18 inches long.

Hello, SEAGATE... this is a PORTABLE DEVICE... Read more
Published 19 days ago by J. Meadors
Great Portable Drive
Love this portable hard drive. I have used it with several different and have never had a problem with it - plus it is big enough to hold all my pictures and music!
Published 21 days ago by Learning Everyday
confusing instructions for use
I installed this exterior HD with no problem. As per instructions, you basically just plug it in and install. However-the instructions for use are absolutely terrible. Read more
Published 24 days ago by T
PHOTOS TAKING UP TOO MUCH SPACE ON LAPTOP
My photos were taking up so much space on the my hard drive that I purchased this external drive to use for storage. The unit is very small and compact. Read more
Published 1 month ago by J. Marx
Search Customer Reviews
Only search this product's reviews


Tags Customers Associate with This Product

 (What's this?)
Click on a tag to find related items, discussions, and people.
 
(24)
(3)

Your tags: Add your first tag
 

Customer Discussions

This product's forum
See all 30 discussions...  
Start a new discussion
Topic:
First post:
Prompts for sign-in
 

Search Customer Discussions
   
Related forums



Look for Similar Items by Category

Capacity: 640 GB