I am looking to purchase a 500 GB USB external HD and I'm seeing a big difference in pricing (e.g. at CompUSA Seagate 500 GB for $379 vs. Western Digital 500 GB for $199). The specs look the same so I'm wondering why the big price difference.
Is there really that much of a difference in performance and reliability or is one HD pretty much as good as another? What should I be looking for in deciding which to buy?