It is not easy protect their data in their external hard drives. Internal software encryption is one of the way to protect it, but for more security advice, you may have to do something for it external physical.
The Lenovo ThinkPad USB Portable Secure Hard Drive is one way to protects unauthorized data access by requiring users to type an access code into an in-built numeric keypad. ThinkPad USB Portable Secure Hard Drive offers high-level 128-bit Advanced Encryption Standard (AES) security within a slim, lightweight, self-powered, easy-to-use design. So you are optimized for safeguarding essential data while on-the-go. The Lenovo ThinkPad USB Portable Secure Hard Drive is available in two options: 320G or 160G of hard drive.