OM Based Disk Encryption (<ACRONYM
CLASS="ACRONYM"
>gbde</ACRONYM
>), and many
     other operating systems support this functionality, including Windows.
    </P
><P
>     This mechanism prevents unencrypted data from being read from the
     drives if the drives or the entire computer is stolen. This does
     not protect against attacks while the file system is mounted,
     because when mounted, the operating system provides an unencrypted
     view of the data. However, to mount the file system, you ne