The best description for this external hard drive is secure. It has a decent reading and writing speed, uses the Advanced Encryption Standard (256-bit) to protect your files better, and has a keypad lock to tighten things further.Moreover, this external storage device is thin, easy to carry, and doesn’t consume a lot of power. One thing that might make people get discouraged with this device is due to its poor aesthetics. It doesn’t seem to look professional or elegant due to the number buttons on its cover, but it does the job at keeping your files safe.What you have here is basically a vault. If you want to bring crucial or sensitive data around, but you’d rather have it missing than be exposed, the Netac K390 is for you.