The term "full disk encryption" is often used to signify that everything on a disk, including the programs that can encrypt bootable operating system partitions, but they must still leave the MBR, and thus part of the disk, unencrypted.
The term "full disk encryption" is often used to signify that everything on a disk is encrypted, including the programs that can encrypt bootable operating system partitions. But they must still leave the MBR, and thus part of the disk, unencrypted.