This is one of the new features that Windows Server presents to us 2008 also available on Windows Vista, the possibility of encrypting our hard drive so that it is impossible to remove any type of data, all encrypted. We can store this key on a USB device such as a USB Pendrive or directly on a floppy disk, without this, The computer will not be able to reboot or decrypt the disk. The typical thing for when they boot our computer from a LiveCD of some tool to extract data or break the Windows password. It's ideal for when you go to the USA and your laptop is taken away at customs, he, Even though they definitely ask you for the password or… They take out the rubber glove ;), but in principle it is information that could not be accessed since it is encrypted.