The Freecom 2.5" / 3.5" mDock Keypad Secure uses 256-bit AES Hardware Encryption to protect the data that is saved onto any internal 2.5" or 3.5'' hard drive inserted into the dock. The keypad allows users to set PIN codes to access the encrypted data that is saved on the hard drive to keep it safe and secure. Everything saved onto HDDs through this docking station will be AES 256-bit encrypted, making the contents of the hard drive 100% secure.