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I'd pick one based on ruggedness and security, because you will be carrying this thing everywhere and it needs to last and needs to keep your data safe in case you lose it. By those metrics, Lenovo's Thinkpad USB 3.0 Secure Hard Drive is my pick.

Plenty of drives can put 750GB in your shirt pocket, but the Lenovo ThinkPad USB 3.0 Secure Hard Drive also puts 256-bit encryption at your fingertips.

This drive proves that a secure portable hard drive doesn't have to be bulky. And while the $169 ThinkPad only boasts half as much storage space as similarly priced, but security-fee portable hard drives, it more than makes up for this deficiency with its robust, easy-to-use security features.

This secure hard drive's exponentially larger capacity and high-flying USB 3.0 performance makes it a better value than secure flash drives.

The Lenovo ThinkPad USB 3.0 Secure Hard Drive does everything you need it to do, without drivers and without impacting speed. Making it super easy to encrypt important information, this drive gets more users in the habit of protecting data before it leaves the workplace.

Secure, portable, durable and good looking. This is what external hard drives should strive to be.