Everyone has some important documents to be kept in the computer, and probably many people protect them with passwords. However, if someone happens to know the password, they can access your computer and get all of your important files. Moreover, many people are worried about the security issues when surfing the Internet, fearing that important files might be stolen. Therefore, it is recommended that you can use such a hard disk security key. It looks like a USB drive, and you can plug it into the computer via USB port. You can place your important files in a partition for storage. Its amazing feature lies in that this partition will only appear after you plug it into the computer. Otherwise, you cannot see this partition, and naturally no one would know there are important files in this partition on the computer, which is very secure. It has a similar effect to the U盾 (U-Shield) used for online payment by Industrial and Commercial Bank of China now. In this way, as long as you keep this hard disk security key well, you can rest assured. Currently, its price is only 12.7 US dollars abroad.