Hot Hardware published a review on the iStorage diskAshur2: Ultra-Secure 256-Bit AES Locked Down External Storage A quote from the article:

The new iStorage diskAshur2 is a specialized, external hard drive geared toward security conscious consumers. The diskAshur2 is a little pricey, and although it's no slouch in the speed department (we'll get into that in a bit), it's certainly not going to compete with that shiny new internal SSD you've got your eye on in terms of transfer speeds. But here's the thing: It's plenty fast enough for just about anything you'd want to do, and just as importantly, it's both rugged and secure. So, despite a somewhat lofty asking price, the diskAshur2 is actually a pretty good deal. If you need its feature-set, you'll be happy to have made the investment for the added security layer...

 iStorage diskAshur2 Review: Ultra-Secure 256-Bit AES Locked Down External Storage @ HotHardware