Via Powerpage.org:

RadTech has released a new and unique hard drive enclosure: the Impact Hard Disk Drive Enclosure w/64-bit Encryption.

The Impact enclosure looks like any other HDD until you notice a funny looking FireWire 400 port on the backplane. That’s where you connect the Impact’s unique 64-bit hardware key. When it’s plugged in, you can access that hard drive as expected. When the key isn’t present, the drive simply won’t mount.

The Enova X-Wall engine provides real-time, hardware-based encryption and decryption. X-Wall shuttles encrypted data as fast as a standard enclosure. Unlike easily circumvented and platform dependent software-based encryption, Impact enclosures strong encrypt (DES) every bit and byte on the hard drive. The included Secure Token is a physical key which must be present to read from, or write to the drive. Without the secure key, the drive and its data are rendered useless and unreadable – 2 keys are included with each enclosure.