DriveCrypt Plus Pack (DCPP) is a Full disk encryption software which partially or fully encrypts your hard disk including the operating system, allowing pre-boot authentication. The User enters a password on computer start up, before the operating system boots up. DCPP is the fastest and most feature-rich real-time encryption system available. DCPP is the only software on the market able to hide the entire operating system inside another one. http://www.securstar.com/ products_drivecryptpp.php