2.5" mDock Keypad Secure 56424 Dual drive for encrypted or unencrypted internal 2.5" HDDs The Freecom 2.5" mDock Keypad Secure uses 256-bit AES Hardware Encryption to protect data that is saved onto any internal 2.5" HDD inserted into the dock. The keypad allows users to set PINcodes to access the encrypted data that is saved on the hard drives to keep it safe and secure. It has a two bay 2.5" hard drive dock – one for encryption and the other for unencrypted drives so you can also use the dock in unencrypted mode if the data is not required to be protected. Housed in a high quality metal enclosure.